Problem:

You are presented with the quiz "What do some parasitic creatures have special structures for?"   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "fungi have special structures for penetrating a host" and "parasitic plants and fungi can attack animals".   So, what's the best answer to the question?
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A: Penetrate animals


Problem:

You are presented with the quiz "What is hurt when the environment changes from green to brown?"   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "adrought can change the color of an environment from green to brown" and "forests are being hurt by the drought".   So, what's the best answer to the question?
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A: forests


Problem:

You are presented with the quiz "Fertilization occurs when _ fuse."   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "fertilization occurs when a sperm and an egg fuse" and "sperm and eggs are cells known as gametes".   So, what's the best answer to the question?
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A: gametes


Problem:

You are presented with the quiz "what uses thirst to realize it needs to replenish bodily water?"   But you don't know the answer, so you turn to your teacher to ask for hints. He says that "thirst is used to make an animal realize that it needs to replenish its bodily water by the body" and "humans are animals too".   So, what's the best answer to the question?
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A:
humans