the answer is D on usatestprep
The right option is; D. It will change shape and take the shape of its container.
Liquid is one of the states of matter and is composed of molecules that are held together by intermolecular bonds. Liquid has a fixed volume, but it does not have a fixed shape. It takes the shape of its container. The density of a liquid is influenced by pressure, and it has surface tension.
Many drugs can be applied to the skin without entering the blood. how is this fact explained?
*A drug administered by the cutaneous route can have one of these three actions:
Local action, superficial: ex. local anesthetic ...
Deep action: ex. anti-inflammatory action ...
Systemic or general action: ex. anti-anginal action
*The skin is a very effective barrier, which limits the number of drugs that can enter the system.
*The factor influencing the penetration of the drugs are:
- Nature and physicochemical properties of P.A: Molecular weight, hydrophilicity, lipophilicity, stability ...
- Formulation of the drug: Excipients lipophilic, hydrophilic, amphiphilic, an absorption promoter
- Nature and condition of the skin, Location, age, thickness (1 to 8 mm ...), vascularization...
*To not penetrate the skin, a drug should have to be of high molecular mass (to be unable to penetrate through the skin tissue), hydrophilic (since the skin is of a lipophilic nature).
*For example, solar creams should not enter the system so the excipients used are hydrophilic in nature.
Long ago, scientists did not know that cells existed because
A) they did not have microscopes.
B) they were too busy studying plants.
C) they were not allowed to do research on animals.
which of these questions is scientific
A: what is the age of earth?
B: should oil drilling be banned
C: should medicines be tests on animals
D: what I thr most interesting subject to study?
What is algin? is it Diatomaceous earth used as an insulating material,
Brown algae,
A substance produced by brown algae used to thicken foods.
Diatom shells
Answer:
An algin is a substance produced by brown algae used to thicken foods.
Explanation:
Alginic acid is an organic chemical compound found in brown algae. Alginate forms highly viscous solutions in water. An alginate molecule is a copolymer made up of the two sugar units of guluronic acid and mannuronic acid. The ratio of the two sugars to the length of the molecule varies.
Alginate is used in the food industry as a solidifying agent and can in many cases replace gelatin. Therefore, since it is a plant product, it is used in a vegetarian diet.
Equal arm balances are used to measure:
a.mass
b.weight
c.density
d.force
i believe it is a mass
Feeling the heat when touching a hot piece of metal is an example of
conduction
convection
radiation
solar
The answer is conduction
What is the difference between sporozoites and merozoites
A sporozoite is the cell form that infects new hosts. A merozoite is the result of merogony that takes place within a host cell.
In Plasmodium, for example, the sporozoites are cells that produce in the mosquito's salivary glands, leave the mosquito during a blood meal, and drive liver cells (hepatocytes), where they generate. Cells infected with sporozoites ultimately burst, delivering merozoites into the bloodstream. Merozoites are non-motile.A merozoite is a daughter cell of a protozoan parasite. Merozoites are the consequence of asexual propagation. Sporozoites are designed by sporogony, a type of sexual or asexual reproduction by multiple fission of a spore or zygote, representative of many sporozoans.
Lillian wonders how fast a train can move around a particular curve before it falls off of the track. Which of the following is the best way for Lillian to figure this out?
A.Drive a train along a curve at different speeds until it falls off of the track.
B.Build a model train and track, and test one train going around one curve at different speeds.
C.Build a model train and track, and test one train going around several different curves at one speed.
D.Build a model train and track, and test different-sized trains going around one curve at the same speed.
Answer: B
Explanation: For Lilian to achieve this she needs to build a model train and track, then test the train going round the curve at different speeds intervals. This would help determine at which speeds the train tends to fall off
A flood that covers the meadow and drowns animals and a late Frost that kills young plants are examples of how blank can affect the size of population
How is it that water manages to travel up roots and into plants if gravity and air pressure are pulling and pushing down on the molecules? Which two properties of water allow this to happen? Explain your answer.
HELP ASAP WILL MARK BRAINLIEST
PLEASE HELP ONLY 2 I CANT GET
1. The graph below shows the change in average beak size of a given bird population. Records indicate that a drought occurred in 1977. Which of the following is the most probable explanation for the observations?
1st Picture
A. A larger beak made it easier to compete for the limited food remaining. In response, the birds grew larger beaks.
B. The seeds available after the drought were large and tough. Working hard to crack those seeds helped the birds grow larger beaks over time.
C. There were only soft seeds available after the drought. More birds chose to develop larger beaks in order to collect and eat the seeds.
D. After the drought, only large seeds were available to eat. Birds with large beaks were better able to crack and eat these seeds.
2. The wing color of a certain species of moth is controlled by alleles at a single locus. Gray (G) is dominant to white (g). A scientist studied a large population of these moths, tracking the frequency of the G allele over time, as shown in the figure below.
2nd Picture
Assuming that the population was in Hardy-Weinberg equilibrium for this gene, what percentage of the moth population was homozygous recessive (gg) in 1975? (2 points)
A. 25%
B. 36%
C. 64%
D. 75%
From the graph, the possible explanation is that B. The seeds available after the drought were large and tough.
Graph.The information in the graph showed that the beak depth increased after the drought.
In this case, the seeds available after the drought were large and tough and working hard to crack those seeds helped the birds grow larger beaks over time.
Also, the percentage of the moth population was recessive (gg) in 1975 is 25%.
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The increase in bird beak size post-drought is most likely due to natural selection favoring the ability to eat larger seeds. The proportion of moths that are homozygous recessive in 1975 can't be determined without frequency information of the G allele.
Explanation:For the first question, the most probable explanation for the increase in beak size after the drought would be D. After the drought, only large seeds were available to eat. Birds with large beaks were better able to crack and eat these seeds. This scenario describes a classic example of natural selection, where a change in the environment creates a selective pressure that gives an advantage to individuals with certain traits, in this case, larger beaks.
As for the second question, if you're looking for the percentage of the moth population that was homozygous recessive (gg) in 1975, this under the Hardy-Weinberg principle can be calculated using the equation p²+2pq+q²=1, where q² represents the homozygous recessive. Without any given information on the frequency of the G allele, I am unable to accurately generate the percentage.
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An adventurer has lost his way in jungle . He lost his watch . Suggest an instrument that can help him to estimate time accurately. Explain the property of light used in creating the instrument.
In the absence of a watch, an adventurer can use a sundial to estimate time. The sundial uses the property of light to create shadows based on the sun's position. It reflects solar time, which differs throughout the year.
Explanation:In the given scenario, our adventurer in the jungle could use a sundial to estimate the time accurately. A sundial is an ancient timekeeping device that utilizes the position of the sun to indicate time. It depends on the principle of the earth's rotation and the change in the sun's position in the sky.
The property of light used in creating a sundial is the casting of shadows. As the earth rotates, the sun appears to move across the sky, causing the gnomon (the object which casts the shadow onto the dial) to cast a shadow in a different position on the sundial throughout the day. The position of the shadow on the sundial can then be used to estimate the time with reasonable accuracy, given that the sundial has been correctly aligned with the cardinal directions.
It's critical to remember that a sundial cannot keep time in the same way as a mechanical clock does—the time it displays changes with the sun's apparent position in the sky, which varies with the latitude of the observer, the time of year, and the mathematical equation of time.
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Which location would be relatively warmer during winters, and why?
An inland location, because land cools down slower than water
A coastal location, because water cools down slower than land
An inland location, because land has higher specific heat than water
A coastal location, because land has higher specific heat than water
Answer:
A coastal location, because water cools down slower than land
Explanation:
The water and the earth have specific heat different from each other.
The water heats up more slowly than the earth, but it also cools more slowly than the earth. For this reason, when we go to the beach we realize that the sand is hot, while the water is cold it causes the air currents to blow from the sea to the beach, because the air above the sand is hotter than the air it is. above the water, and the hot air goes on and the cold goes down. During the night, this is reversed, as the water is still hot, and it gets hotter than the sand, which cools faster, reversing the breezes.
In summary, because the water's cooling speed is slower than that of the land, we can say that a coastal location would be a relatively hot spot during the winter, because the land has a higher specific heat than water
describe the milankovitch cycle.
The Milankovitch Cycle refers to cyclic changes in Earth's orbit, including eccentricity, obliquity, and precession, which influence the climate by altering the amount and distribution of solar radiation received by Earth.
Explanation:The Milankovitch Cycle, as established by Serbian astronomer Milutin Milankovich, is a theory that describes the cyclic changes in Earth's orbit and its impact on climate. This cycle involves three main components: eccentricity, obliquity, and precession.
Eccentricity refers to the variation of Earth's orbit from more circular to more elliptical, following a cycle of about 100,000 years. This change influences the proximity of the Earth to the Sun, thereby altering the amount of solar radiation the Earth receives.
The next component, obliquity, refers to the changes in the inclination of the Earth's axis. This change can result in varying degrees of solar radiation being received by different areas of the Earth, contributing to climate changes.
Finally, precession is the Earth's slow wobble as it spins on the axis which may result in more extreme climates and ice ages. This effect can sway the balance of climate, instigating dramatic shifts such as the ice ages.
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The ___ is to sensory input as a major city is to a country's airplanes, through which all air traffic passes an route to the various destinations. Amygdala, cortex, thalamus, reticular formation
Lillian wonders how fast a train can move around a particular curve before it falls off of the track. Which of the following is the best way for Lillian to figure this out?
A.Drive a train along a curve at different speeds until it falls off of the track.
B.Build a model train and track, and test one train going around one curve at different speeds.
C.Build a model train and track, and test one train going around several different curves at one speed.
D.Build a model train and track, and test different-sized trains going around one curve at the same speed.
Answer:
B.Build a model train and track, and test one train going around one curve at different speeds.
Explanation:
If Lillian wants to know how fast a train can move around a specific curve before it falls off the track, she must build a model of train and track and through that model she will test a train traveling through a curve at different speeds. That way she can analyze in detail the phenomenon she wants to observe and get answers.
She should never drive a train along a curve at different speeds until it falls off the track, because that would be very dangerous and irresponsible. For this reason, models are great for people to be able to analyze phenomena and situations that would not be right to analyze in real life.
Which of the following best defines weather?
Events that happen over a long period of time
A seasonal pattern of events in the hydrosphere
The atmospheric conditions at a particular time
A measure of kinetic energy in the atmosphere
Question 3(Multiple Choice Worth 3 points)
What do weather and climate have in common?
Both affect average ocean temperatures.
Both are averages measured over a long period of time.
Both apply to a certain region.
Both change from day to day.
Question 4(Multiple Choice Worth 3 points)
Something used to represent a complex idea or process in science is a
program
microscope
hypothesis
model
Question 5(Multiple Choice Worth 3 points)
PLEASE HELP ASAP
Which of the following best defines climate?
Short-term atmospheric conditions of a region
The weather pattern of an area over two weeks or less
Average weather conditions of a region over the long term
A pattern of weather that never changes
Question 6 (Essay Worth 5 points)
Give one example of a question that science would not be able to test. Then, explain how it could be changed into a testable question.
Answer:1. The atmospheric conditions at a particular time.
3. Both apply to a certain region.
4. model
5. Average weather conditions of a region over the long term.
Explanation:
1. The weather can be define as the atmospheric condition of a region for a particular period of time. It can be determined by the amount of sunshine, rainfall and wind the region receives.
3. The weather and climate conditions are both applicable in determining the atmospheric condition of a region. These are two informative aspects of the atmosphere which are measurable.
4. A model is the simulation of a natural processes which occur on earth. This is descriptive and demonstrative approach which can be used to study the cause of a natural event or phenomena and the factors associated with them.
5. A climate can be define as a constant weather condition of a region for a period of atleast 30 years. It can be measured on the basis of wind velocity, precipitation and temperature.
6. A testable scientific question is the one which can be answered using suitable experimental procedures. The data obtain can be used to answer the question.
1. What is better, ice cream or potato chips? - non-testable
2. Which has more nutritional value, ice cream or potato chips?- testable
The first question is non-testable because it cannot be answered scientifically, as it does not include the parameter on which the food items should be compared. The second question is testable because a particular parameter called as nutritional value is to be compared between the two food items.
Final answer:
Weather is defined as the atmospheric conditions at a specific time, while climate is the average weather conditions over a long period in a region. Both apply to a certain region, and a model is used in science to represent complex processes. Non-testable questions can often be rephrased into testable ones by focusing on observable phenomena.
Explanation:
The best definition for weather is the atmospheric conditions at a particular time. This includes temperature, humidity, precipitation, cloudiness, brightness, visibility, and wind that are experienced at a specific place and time. In contrast, climate refers to the average weather conditions of a region over the long term, which involves a consistent pattern of temperature and precipitation over many years.
What weather and climate have in common is that both apply to a certain region. They are interrelated concepts, with weather describing short-term atmospheric conditions and climate representing the long-term patterns of these conditions.
A concept used to represent a complex idea or process in science is a model. Scientific models help researchers and scientists to simulate and predict phenomena, often involving climate and weather.
Regarding a scientific question that cannot be tested, an example might be 'Why does the universe exist?' This question is based on philosophical or existential inquiry that science is not equipped to test due to its speculative nature. To make it a testable scientific question, one could rephrase it to 'What are the observable phenomena that suggest the origins of the universe?' which can then be investigated using astronomical observations and physics theories.
an animal cell hat is surrounded by fresh water will burst because the osmotic pressure causes?
A water to move into the cell
B water to move out of the cell
C solutes to move into the cell
D solutes to move out of the cell
what are two ways nitrogen can get into the ground?
When a star's nuclear energy runs out, it dies. A star can die in many ways. A _____ is one way a star might die, and it can trigger the beginning of a new star's life cycle.
How do temperature differences in the protoplanetary disk explain the arrangement of the planets in the solar system?
describe two important ways that marine ecosystem impact the planet
A machine will always increase the force required to complete a task.
true or false
Does anyone know the answer to this ? What happens if you poke a hole in the plastic bottle of a balloon lung model?
______________ are nerve cells that carry response information to muscles and organs.
A. energy
B. motor neurons
C. sensory neurons
Give an example of ionic bonds and covalent bonds occuring in nature.
Describe three events that you cannot explain
Three events that are often described as 'unexplainable' would be the disappearances in the Bermuda Triangle, the unpredictable nature of earthquakes, and the mysterious phenomenon of deja vu.
Explanation:Upon analyzing the question, it seems like you're looking for three unexplainable events. There are many instances in history, science, or daily life that can remain puzzling. For instance, the mystery behind the Bermuda Triangle, where numerous airplanes and ships have disappeared without explanation, is one such event. Second, the prediction and patterns of earthquakes have confused scientists for years. Lastly, the phenomenon of deja vu, a feeling that one has lived through the current situation before, is a psychological event that experts have yet to fully understand.
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Which of the following is a true statement about remote sensing?
Which level of organization is made of different types of tissue working together to perform a specific job for your body
Which kind of organism is a heterotroph?
Answer:
Heterotrophs are defined as those organisms that cannot prepare their own food. It is because they cannot carry out the process of photosynthesis. They are depended either directly or indirectly on the producers (autotrophs) as they obtain their food and energy from the autotrophs, in order to survive.
In term of the food chain, the heterotrophs are usually considered as the secondary as well as the tertiary consumers. The heterotrophs include the Herbivores (such as sheep, horse), carnivores (such as lion and tiger) and the omnivores (humans and microbes).