Biology

Which of the following is a signal that you are hungry?

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Which of these animals competes with a lion for food?
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What does the substance melanin control?
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What color is a polar bear's skin?
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What is a hominid?
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What insect looks like a twig on a branch, bush or tree?
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What North American animal is mistakenly called a buffalo?
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What is the natural sonar that some animals use called?
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Which nutrient group is used to help grow and repair cells?
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