Biology

What fluid-filled sac surrounds the human embryo?

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Which human body system breaks down food?
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What's the term for the dependence of a plant on the proper day-length to flower?
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What are the long strands of genetic material in the nucleus called?
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Which of these animals is closely related to sharks?
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What is an automatic response that doesn't involve the brain called?
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What is the correct order of a butterfly's life cycle?
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What is the largest-blooming single flower in the world?
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What vitamin refers to a family of related compounds called tocopherols?
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