Biology

How many chambers make up the human heart?

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Which organ churns the food we eat?
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What are people suffering from Celiac disease allergic to?
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What body covering do mammals have that other animals do not?
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What are squirrels thought to bury to store for a winter supply of food?
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Which of the following is a virus?
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What nutrient do girls need more of than boys when they are growing?
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Which famous scientist introduced the idea of natural selection?
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Which is a change in the environment that brings a response?
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