Why is Big Bang a theory and not a fact ?

The most abundant elements in the earth's atmosphere are;  nitrogen, oxygen and argon. What they have in common is that they are all gases.

Nitrogen is the most abundant element in the atmosphere. It constitutes about 78% of air.

The next most abundant element in the atmosphere is oxygen. Oxygen accounts for about 21% of air.

The third most abundant element in the atmosphere is argon and it accounts for 0.9% of air.

All the elements listed here are gases at room temperature.

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Answer:

Explained below

Explanation:

Effects of Drug Abuse:- Surveys show that use of drugs has been on the rise especially among the youth. This is really a cause of concern as it could result in many harmful effects. The drugs, which are commonly abused are opioids, cannabinoids and coca alkaloids. Majority of these are obtained from flowering plants. Some are obtained from fungi. Proper education and guidance would enable  youth to safeguard themselves against these dangerous behaviour patterns and follow healthy lifestyle.

"The effects of drug abuse are far-reaching and can be devastating to individuals, families, and communities. Drug abuse, which refers to the excessive and harmful use of psychoactive substances, including alcohol and illicit drugs, leads to a wide range of negative outcomes that can be physical, psychological, social, and economic in nature.

Physically, drug abuse can cause a variety of health problems. These include liver damage from alcohol abuse, lung and heart problems from smoking substances like tobacco or marijuana, and increased risk of infectious diseases such as HIV and hepatitis from injection drug use. Chronic use of certain drugs can lead to severe physical dependence and withdrawal symptoms when use is reduced or stopped.

Psychologically, drug abuse can alter brain chemistry, affecting mood, perception, and decision-making. It can lead to mental health disorders such as depression, anxiety, and psychosis. Long-term drug use can also impair cognitive functions, including learning and memory, which can persist even after drug use has ceased.

Socially, drug abuse can strain relationships with family and friends, leading to isolation and social dysfunction. It can also result in poor performance at work or school, job loss, and legal problems, including arrest and incarceration. Children and adolescents who are exposed to drug abuse in the home are at increased risk for neglect, abuse, and their own future substance use disorders.

Economically, the impact of drug abuse is substantial. It includes the costs of healthcare, lost productivity, crime, and social welfare programs. The financial burden extends to the criminal justice system, where a significant portion of crimes are related to drug abuse, including possession, trafficking, and actions committed under the influence of drugs.

Furthermore, drug abuse contributes to public health issues by increasing the risk of motor vehicle accidents and other injuries due to impaired judgment and coordination. It also places a burden on emergency services and treatment facilities, which must allocate resources to address drug-related health crises.

Preventing and treating drug abuse requires a comprehensive approach that includes education, prevention programs, accessible treatment options, and support for recovery. Public awareness campaigns can help to reduce the stigma associated with drug addiction, encouraging individuals to seek help. Effective treatment modalities, such as cognitive-behavioral therapy, medication-assisted treatment, and support groups, can aid in recovery and reduce the likelihood of relapse.

 In conclusion, the effects of drug abuse are multifaceted and can have a profound impact on every aspect of an individual's life. Addressing this issue requires a concerted effort from healthcare providers, policymakers, educators, and community leaders to implement strategies that prevent drug abuse, provide effective treatment, and support long-term recovery. By doing so, we can mitigate the individual and societal costs associated with drug abuse and promote healthier, more productive communities."

Answer:

Biodiverisity can increase the rate of extinction

Explanation:i did the quiz my self thats teh answer for this question

Answer:

Size range(cm)    Year 1900     Year 1950     Year 2000

    51 - 60                    1                    0                     0

    61 - 70                    1                     1                     0

    71 - 80                   2                    2                     2

    81 - 90                   2                    5                     7

    91 - 100                  2                   3                     2                

   101 - 110                  3                    0                    0

Explanation:

Your data table is actually color-coded, so all you needed to do was count. Looking at your frequency table, you can see that a color corresponds to certain colors.

For example 51 - 60c, corresponds to the light green. Looking at the data table, you see 1 light green block in the column of 1900. As it happens, it also is the only measurement that falls within the range 51 - 60 so you have 1 sea star. In the Year 1950, there is none, and you won't find one in Year 2000, so both frequency count is 0.

Answer:

meiosis

Explanation:

When cells divide during meiosis, homologous chromosomes are randomly distributed during anaphase I, separating and segregating independently of each other. This is called independent assortment.

Final answer:

Segregation and independent assortment take place during meiosis, causing homologous chromosomes to separate and ensuring genetic diversity in gametes. These processes are fundamental to Mendelian genetics and biological inheritance. Mitosis does not involve segregation of alleles but produces identical daughter cells.

Explanation:

Segregation and independent assortment of genetic material occurs during meiosis. Segregation refers to the separation of homologous chromosomes to different cells during meiosis, ensuring that gametes receive only one allele of each gene. This reflects the law of segregation by Mendelian genetics. Recombination also occurs through mating, which results in new combinations of genes.

Independent assortment takes place specifically during the anaphase-I stage of meiosis I. This is where chromosomes inherited from both the maternal and paternal side are sorted into gametes in a random manner, leading to genetic diversity. Equal segregation of alleles into daughter cells occurs only in meiosis; mitosis produces genetically identical daughter cells without allele segregation.

Genetic variation is heightened during meiosis I through crossover events, and further completion of meiosis II creates four unique haploid cells. These processes contribute to the genetic diversity seen in sexually reproducing organisms and are critical in understanding genetic inheritance and genetic disorders.

Answer:

There are different energy conversions which we encounter in day to day life. Some of them are:

1) We use chemical energy in the food to convert it into mechanical and kinetic energy which we need for walking to the school.

2) We use chemical energy to be transferred into electrical energy which is converted to light energy in our bulbs so that we can see.

3) We convert electrical energy in the toaster to thermal energy to make breakfast.

Final answer:

In chemical reactions, a chemical bond is formed when compounds are joined. These reactions transform reactants into products with the conservation of atoms, which are reorganized into different arrangements.

Explanation:

When compounds are joined through reactions, a chemical bond is formed. Compounds are created when two or more elements chemically combine, and during this process, they form bonds. These bonds hold the atoms together, resulting in the formation of a new substance. Chemical reactions involve the transformation of reactants into products, where reactants are the substances at the start of the reaction, and products are the substances found at the end.

An important aspect of chemical reactions is that atoms from the reactants are rearranged but not created or destroyed, as per the law of conservation of mass. For example, when hydrogen reacts with oxygen, the atoms rearrange to form water (H2O), with the chemical equation 2H2 + O2 → 2H2O.

Final answer:

Ripples in a pond and seismic waves both exhibit wave properties such as carrying energy and having transverse and longitudinal properties, but they differ in their mediums and in what they can reveal about the medium's structure. Seismic waves travel through solids and are used to study the Earth's interior, whereas water waves are restricted to the surface. Both types of waves can experience superposition, where they pass through each other without altering their individual properties.

Explanation:

The ripples moving through the water in a pond are similar to seismic waves traveling through the Earth in that both are forms of wave motion that carry energy away from a source through a medium. With water waves, the disturbance is in the surface of the water, while seismic waves involve disturbances in the Earth's crust and mantle. Water waves cause water molecules to move in a clockwise circular motion due to their transverse and longitudinal properties. Seismic waves also exhibit transverse and longitudinal movements but in solids, with different types of seismic waves (P-waves and S-waves) showing different motions.

However, there are important differences too. Seismic waves can travel through the solid Earth and are used to probe its internal structure. In contrast, water waves are primarily confined to the surface of the liquid and reveal less about the water's depth. Furthermore, when it comes to interference, water waves and seismic waves can exhibit superposition, where they pass through each other without being altered. This characteristic is shared with other wave types, including sound and light waves. Lastly, multiple ripples in a pond are formed from a single disturbance due to the interaction of reflected waves coming from the edge of the pond, while seismic waves typically propagate as expanding waves from an earthquake's epicenter with little to reflect from.

Answer:

Diagram is needed please

Explanation:

diagram

The structure in the diagram that would normally represent homologous pairs of chromosomes is 1, only.

Structure 1: This represents a diploid cell, which means it has two sets of chromosomes. Each set contains one chromosome inherited from each parent. These chromosomes are homologous, meaning they have the same genes but may have different alleles (versions of the genes).

Structure 2: This represents a haploid cell, which means it has only one set of chromosomes. These cells are typically gametes, such as sperm or egg cells. Homologous pairs are not present in haploid cells.

Structure 3: This represents a mitotic cell, which is in the process of dividing to produce two daughter cells. During mitosis, the chromosomes replicate and then separate, so each daughter cell will receive one copy of each chromosome. Although the daughter cells will have homologous chromosomes, they are not shown paired in this diagram.

Therefore, the only structure that normally represents homologous pairs of chromosomes is structure 1, the diploid cell

complete question is attached

Cancer cells have gene mutations that turn the cell from a normal cell into a cancer cell. These gene mutations may be inherited, develop over time as we get older and genes wear out, or develop if we are around something that damages our genes, like cigarette smoke, alcohol or ultraviolet (UV) radiation from the sun.

Answer:

Of the three kinds of substances that make up matter in nature which one forms most minerals? Most minerals are chemical compounds.

Explanation:

Final answer:

Silicates, composed of silicon and oxygen, are the most abundant class of minerals in the Earth's crust, forming around 90% of it and contributing to the diversity of rocks.

Explanation:

Of the three kinds of substances that make up matter in nature, silicates form most of the minerals found in the Earth's crust. Silicates, a large and complex class of minerals, are composed of silicon and oxygen, with the most common type being the silicate mineral with a base structure of (SiO₄)⁴⁻. Silicate minerals, such as quartz and feldspar, constitute approximately 90% of the Earth's crust due to the abundance of silicon and oxygen. These minerals are not only significant in quantity but essential for creating a diverse range of rocks and subsequently the landscape of our planet.

Answer:

An Earthquake

Explanation:

Answer:

There are two events that occur underwater to cause a tsunami. The first occurs when there is a landslide on the coast and the water is pushed by the force causing a tsunami. The second is when there occurs a landslide right under the water causing the water to push due to the natural forces generated by the landslide

Explanation:

The correct order is 2, 1, 5, 3 and 4.

As per Dalton’s theory, atoms were described as the indivisible and indestructible parts of matter which forms any object. But this theory was discarded.

Then came J J Thompson’s Plum Pudding model which described atoms as a mixture of positive and negative charges just like a pudding. But it was also discarded.

Then comes Rutherford's solar system model which described Atoms as mostly empty spaces where the nucleus resembles Sun with positive charge and electrons as planets revolving the sun.

The came Bohr’s theory which described the shells of Rutherford as specific energy levels, not just mere orbits. This led to explain flame colorings of many elements.

Then came Hizenberg's uncertainty principle and Schrodinger’s model of atom which basically described the quantam theory of atoms.

Answer:

Development delays

Explanation:

Cuz it effect the brain the most

Answer and Explanation:

Hydrogen ions in the thylakoid space form an electrochemical gradient because of the difference in the concentration of protons (H+) and the difference in the charge across the membrane that they create. This potential energy is stored as chemical energy in ATP through chemiosmosis. The hydrogen ions are allowed to pass through the thylakoid membrane through an embedded protein complex called ATP synthase. Energy from the electron fuels membrane pumps that actively move hydrogen ions against their concentration gradient from the stroma into the thylakoid space. The photon causes an electron in the chlorophyll to become excited.

Exercise increases the rate of cellular respiration, which is needed to meet the heightened energy demand by producing more ATP. Endurance and resistance training lead to different cellular adaptations to improve performance. Cellular respiration becomes more efficient with regular training, enhancing energy production.

Exercise affects the rate of cellular respiration by increasing the demand for ATP, which in turn requires a rise in the production of energy via cellular respiration. Aerobic respiration is significantly more efficient than glycolysis, as it produces approximately 36 ATP molecules per glucose molecule compared to four ATPs from glycolysis. Nevertheless, aerobic respiration needs a continuous supply of oxygen, which is facilitated by increased breathing and heart rates during exercise, enhancing O₂ delivery to muscles.

Endurance training leads to cellular adaptations, such as an increase in mitochondrial density, which enhances aerobic respiration efficiency and oxygen utilization. In contrast, resistance training causes muscular adaptations primarily related to muscle strength and size. After intense muscle activity, the body must repay the oxygen debt incurred, which necessitates increased oxygen intake post-exercise to replenish ATP, convert lactic acid back to pyruvic acid, and restore muscle energy reserves.

Thus, when we exercise, our cells respond by ramping up the cellular respiration process to meet increased energy demands. This is why an athlete's body becomes more efficient at using oxygen and generating ATP over time with regular training.

The correct answer is B. The percentage of the population with white fur will decrease

Explanation:

In the case presented, the fur of rabbits is related to an adaptation to survive during different seasons. In this way, the white fur is needed during winters as this helps rabbits to camouflage in an environment of snow providing them with a survival and reproduction advantage. On the other hand, the brown fur is better during summer as they need to camouflage between the brown trees, grass, and plants.

According to this, if temperature increases and therefore snow decreases the rabbits with brown fur will prevail as this will make them more likely to survive and reproduce, for example, a rabbit with white fur would be easily found by predators if there is no snow. Thus, in this case, "the percentage of the population with white fur will decrease".

Adaptation is the process in which an organism adjusts itself to survive in its surrounding. Adaptation can be affected by climate, rainfall, predators, and temperature.

The population of rabbits will be:

Option B: The percentage population with white fur will decrease.

In the given case, the fur of rabbits ranges from brown to white. The changes in the fur colour are due to the adaptability of rabbits to the given environment.

In winters, white fur is by rabbits because it will help in camouflaging in a snowy environment, which will provide them high chances of survival and reproduction advantage.

Conversely, the brown fur will be better suited in the summer as they will be easily camouflaged in brown trees, soils, and plants.

The rise in temperature will cause a decrease in the rabbits with white fur. The brown fur rabbits will have more tendency to survive and reproduce in summers.

Thus, the population of brown fur will increase in high temperatures and rabbits with white fur will decrease.

Therefore, option B is correct.

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Answer:

A. changing

Have a magnifecent day!

Scientific knowledge is both long-lasting and always subject to change. This evolution is inherent to the scientific method which emphasizes constant testing, refinement, and modification of ideas based on new evidence or data.

The correct option is A: changing. While scientific knowledge can remain unchanged for a long time, it is always subject to change as new evidence or data emerges. Science is a dynamic and evolving field; scientists constantly test theories and hypotheses and refine them as needed. This is a cardinal characteristic of the scientific method: ideas must be testable and, as a result, potentially changeable. Hence, scientific knowledge is both long-lasting and always changing.

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Answer:

C.Regulating the body’s homeostasis, hunger and eating, thirst and drinking, and other functions of basic survival .

Explanation:

In the figure, highlighted region of the brain is hypothalamus. Hypothalamus is located above the pituitary gland and under the thalamus in the central region of the brain. It is small in size (pea size). It interacts with the pituitary gland regulates the endocrine glands by releasing hormones. Mainly, it regulates the homeostasis in the body by controling body temperature in warm and cold weather, hunger and thrust, fatigue and sleep, and circadian rhythms.  In a nutshell, it links the nervous system to endocrine system and is known for central neuroendocrine functions.

Final answer:

The central region of the brain above the brain stem involves the cerebrum, which is responsible for higher functions such as controlling voluntary body movements, processing sensory information, and facilitating thoughts and learning.

Explanation:

The central region of the brain highlighted above the brain stem is likely referring to parts of the brain such as the cerebrum, which includes the cerebral cortex responsible for higher brain functions. The responsibilities of this region of the brain include:

Controlling voluntary body movements, processing information from sense organs, thoughts, and learning abilities

Regulating the body’s homeostasis, hunger and eating, thirst and drinking, and other functions of basic survival

Coordinating movement and balance by using information from sensory nerves, including hand-eye coordination

The brain stem itself controls basic body functions such as breathing, heartbeat, and digestion, and carries information back and forth between the cerebrum and spinal cord.

Answer:

Landon and and Emily are eukaryotic products of sexual reproduction.

Explanation:

The reproduction in which the male and female gametes fuse to form genetically different organisms is syngenesis.

Landon and Emily are the eukaryotic products of syngenesis.

Syngenesis can be explained as:

The syngenesis occurs in the organisms differentiated into male and female. The gametes of the male and female fuse to form the offspring containing information from mother and father.

The syngenesis increases genetic diversity, species or organisms adapt to the environmental conditions, and diseases are less likely to affect the population.

Thus, the correct answer is Option D.

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Answer:

Mouse

Explanation:

If you follow the Rule of 10%, the mouse gains the most energy from the seeds. The snake and the hawk only get 10% of that energy the mouse has consumes.

For example, follow the rule of 10% pyramid.

Producers: 1,000,000 kcal (energy)

Primary Consumers: 100,000 kcal

Secondary Consumers: 10,000 kcal

Tertiary Consumers: 1,000 kcal

In this sense, the seeds are the producers, the mouse is the primary consumer, the snake is the secondary consumer, and the hawk is the tertiary consumer.

Answer:

Rex is not a Tyrannosaurus rex because each of his hands has three fingers. Tyrannosaurus had only two fingers on each hand.

Answer:

two fingers on one hand and two  on the other

Answer:

reactant

Explanation: water provides hydrogen during photosyn thesis for glucose

Answer:

RNA polymerase is blocked by the repressor

The lac operon is on when the repressor protein get fallen off the operator.

An operon or a group of genes with a single promoter, which encodes genes for the metabolism and transport of lactose in E.coli and other bacteria. In the process, the group of three genes need to be turned on before the bacterium, that is, E.coli can utilize lactose as food.

In the absence of lactose, the lac repressor, that is, the DNA-binding protein combines with the region known as the operator that switches off the lac operon. When binding of lactose takes place with the repressor, it makes the repressor to fall off the operator, hence, turning the operon on.

Thus, when the repressor protein gets fall off the molecule, it shows that the lac operon is turned on.

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Answer:

Hypothesis is tested "by performing a controlled experiment"

Explanation:

An hypothesis can be defined as the explanation which is proposed based on the evidence available. Based on this hypothesis further investigation can be done. a hypothesis can be tested by performing a controlled experiment and making observations. The results of the experiment will discard or prove the hypothesis right. The idea of the hypothesis can be verified by conducting various observation and experiments related to the data available. A guess on the theory can also be considered as a hypothesis. We can conclude as wild guess rather being well developed theory.

Answer:

by performing a controlled experiment

Explanation:

Answer:

Homologous structures can be described as the structures which are similar to one another present in different organisms. These similarities depict that the organisms might have a common ancestor i the past. For example, the forelimb of man, birds, dogs.

Analogous structures can be described as structures in different organisms which perform the same function but might not have a common origin. For example, the wings of bats and birds.

Epigenetic regulation mechanism and Repressors and transcriptional activators allows eukaryotic organisms is to regulate genes.

Explanation:

The gene expression regulation process in eukaryotic cell is complicated than when compared to the gene expression regulation process. In the organisms like multicellular, the regulation of gene expression obtained by the proteins. The regulation of genes in this type of organisms doe not take single level of execution.

Before the transcription stage begins, the DNA access is initially regulated. This process of regulation is termed as epigenetic regulation. There are 20,000 genes that are encoded by the genomes in human beings. These are arranged in such a way that they will be used by the particular type of cells when there is any need.