Problem:

You are presented with the quiz "What breaks up into two lighter elements when an animal divides into two parts?"   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "fission takes place when an animal divides into two parts" and "if the nucleus breaks up into lighter elements, it is called fission ".   So, what's the best answer to the question?
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A: the nucleus


Problem:

You are presented with the quiz "Land degradation causes what effects on the enviroment?"   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "erosion of soil has a negative impact on the environment" and "across the earth, land degradation is on the rise through erosion, salination, pollution, etc".   So, what's the best answer to the question?
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A: negative


Problem:

You are presented with the quiz "Objects that are a few nanometers in size can be seen only with:"   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "viruses are so small that they can be seen only with an electron microscope" and "viruses Viruses are very small, a few nanometers in size".   So, what's the best answer to the question?
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A: an electron microscope


Problem:

You are presented with the quiz "Sweat cools the body when it"   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "sweat wets the skin, and when it evaporates, it cools the body" and "evaporation is when a liquid turns into a gas".   So, what's the best answer to the question?
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A: