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Brown recognizes and names the cell nucleusHooke coins the word cell after viewing cork cells with primitive microscopePasteur disproves spontaneous generation and proposes germ theorySchleiden & Schwann propose cell theoryVirchow describes cell division; proposes that all cells arise from other cellsvan Leeuwenhoek discovers bacteria with his improved microscope

Answer is: b) blue.

Neutral litmus paper turns red in acidic solutions and turns blue in alkaline solutions. At neutral pH, litmus paper does not change color.

Acids and bases have opposite properties and have the ability to neutralize each other. Acids taste sour, give sharp stinging pain in a wound and react with metals to produce hydrogen gas.

Bases turn red litmus paper blue and acids turn blue litmus paper red.

The Biosphere is the sphere that extends from inside Earth's crust to the lower atmosphere. It is a global ecosystem composed of living organisms and their nonliving surroundings. This includes all places where life exists, from deep in the ground, through land and water surfaces, to the lower atmosphere.

The sphere that extends from inside Earth's crust to the lower atmosphere is known as the Biosphere. The Biosphere encapsulates all parts where life exists, starting from deep in the Earth's crust, through surface land and bodies of water, up to the lower atmosphere. It is a global ecosystem composed of living organisms (biota) and the abiotic (nonliving) factors from which they derive energy and nutrients.

Examples of places within the Biosphere include subterranean regions, forests, oceans, lakes, rivers, and the air around us. All living organisms, from the smallest bacteria to the largest trees and animals, are a part of the Biosphere.

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Heat can never flow from cold to hot So, the correct option is (B).

Heat is defined as the transfer of kinetic energy from one medium or object to another medium or from an energy source to a medium or object. These energy transfer can occur in three ways: radiation, conduction, and convection.

When two bodies at different temperatures are brought together, energy is transferred, meaning that heat flows from the hot body to the cold body, so the effect of this transfer of energy is usually, but not always, the temperature of the cold body increases. and decrease in hot body temperature. So, there is no flow of heat from cold to hot.

Thus, heat can never flow from cold to hot So, the correct option is (B).

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Answer:

Volume

Explanation:

Intensive properties do not depend on the mass of the matter whereas extensive properties do depend on the mass of the matter. Mass and volume are examples of extensive. Hence option D is correct.  

Options A, B and C are incorrect as magnetism, boiling point and thermal conductivity are all intensive properties.  

Option D is correct for your question.

An intensive physical property does not depend on the amount of matter. Following this rule, it's easy to see Volume is not an intensive physical property.

The correct order of the steps in the scientific method begins with asking a question, followed by research, formulating a hypothesis, conducting an experiment, collecting data, analyzing the results, forming conclusions, and reporting the findings.

The scientific method is a structured approach to inquiry that is used across various scientific disciplines. To answer the question on the correct order of the steps involved in the scientific method, the sequence that properly represents this process is as follows:

These steps ensure that scientific research is conducted systematically, and findings can be replicated and validated by other scientists. It's important to remember that this process can be iterative. If the results lead to new questions or the hypothesis is not supported, the cycle begins anew with refinements to the hypothesis or new experiments.

Final answer:

Correct answer - D. Whenever valence electrons are transferred between atoms, a chemical reaction occurs, leading to the formation of ionic or covalent bonds and the creation of ions.

Explanation:

The occurrence described in the question, where valence electrons are shared or transferred between atoms, corresponds to option D, A chemical reaction. This is a central concept in chemistry where elements interact to form compounds. When an atom gains or loses electrons, it becomes an ion: a cation if it loses electrons (and therefore has a positive charge), or an anion if it gains electrons (resulting in a negative charge). The transfer of electrons leads to the formation of ionic bonds, as seen in the production of table salt from sodium and chloride. When electrons are shared between atoms, this typically leads to the creation of covalent bonds.

Answer: C) Why should endangered animals be protected?

Explanation:

A science is a discipline which can answer questions related to the cause of natural processes or events occurring in the natural world. The questions related to science can be answered by experimental procedures.

C cannot be answered by science as it is a question of moral question related to social ethics. The endangered animals if abolished will negatively reduce the biodiversity of the organisms living on earth.  

Answer:

Protons and neutrons

Explanation:

Protons and neutrons are found in the nucleus of the atom.

To convert from mm3 to m3, use the conversion factor of 1 m3 = 10^9 mm3. You then divide the given quantity in mm3 by this conversion factor to find its equivalent in m3, finding that 2.0 mm3 is equal to 2.0 x 10^-9 m3.

In order to convert mm3 to m3, the relationship between the units is crucial. In this case, there are 1,000,000,000 (10^9) cubic millimeters in one cubic meter since 1 meter equals 1000 millimeters, you cube this to get the conversion in volume. Thus, the conversion factor would be 1 m3 = 10^9 mm3. Therefore, to convert 2.0 mm3 into m3, you divide the cubic millimeter by this conversion factor.

Formally, you perform the operation as follows:

So, the correct answer is 2.0 x 10^-9 m3

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Answer:

A) when a catalyst is added  

Explanation:

The missing options are:

A) when a catalyst is added  

B) when the temperature drops  

C) when the pressure is lowered  

D) when the molecules are large and bulky

A catalyst increases the rate of a chemical reaction without undergoing a permanent chemical change.  They provide an alternative pathway to the reaction which has a lower activation energy than the non-catalyzed mechanism, this increase the reaction rate.

Answer: kinetic and potential energy

Explanation:

kinetic is energy of motion

energy that can move

potential is stored energy

energy that cant move

100% correct

Answer: b.Its results can improve lives, but sometimes consequences are negative.

Explanation:

Biotechnology is a field of science which deals with use of technology and biological sciences to solve problems related to diseases, disorders, and improving the quality of organisms.

In this a practice of genetic engineering is petfomed in which the genome of organisms are manipulated so as to introduce a new gene or to delete a gene which is causing disease.

Sometimes the results of these scientific processes are good thus helps in increasing the yield of the organism (plant or animal), introduces new traits, helps in erradication of diseases or disorders and others. But sometimes the results are harmful for the organism like instead of recovering from disease the organism becomes susceptible to many diseases. Also with the introduction of new traits some beneficial traits are suppressed.

An unbalanced net force must be applied.

Final answer:

Without a chemical reaction formula, it's not possible to calculate the number of O2 molecules that can be made from 492 grams of sodium phosphate.

Explanation:

The number of O2 molecules made from 492 grams of sodium phosphate requires a stoichiometric calculation based on the chemical reaction involved. However, since no reaction is given, we cannot accurately determine the amount of O2 that could be produced from sodium phosphate. We would need the balanced chemical equation for the decomposition or reaction involving sodium phosphate to calculate the number of O2 molecules formed.

Final answer:

The key difference is that a heterogeneous mixture is non-uniform with visible components, whereas a homogeneous mixture is uniform and components are not visibly distinct.

Explanation:

Differences Between Heterogeneous and Homogeneous Mixtures

A heterogeneous mixture consists of two or more substances and is non-uniform, meaning the individual components can often be seen and are not consistent throughout the mixture. Examples include sand and water, Italian dressing, and chocolate chip cookies. Homogeneous mixtures, on the other hand, are uniform throughout; the components are well mixed and indistinguishable. Examples include salt dissolved in water and air. These mixtures can also be solutions or colloids when the mixture has a consistent composition and appears uniform at the microscopic level.

In summary, the main difference lies in the uniformity of the mixture. Homogeneous mixtures are uniform in composition and phase, whereas heterogeneous mixtures have a variable composition and can often be separated into their individual components through physical methods such as filtration.