Biology

Which of the following is on the lowest level of ecological organization?

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Which of these is a sense that humans are known to have?
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How many chambers make up the human heart?
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Which of these animals has its shelter on its back?
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What is the name of the tube that carries blood to the heart?
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What is illegal hunting of an animal called?
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Which rays of the sun can damage the skin?
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What squirts into your mouth as you chew food?
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Which of these body systems helps your body keep its shape and gives protection?
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