Biology

What fluid-filled sac surrounds the human embryo?

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Who devised a simple test to determine the health of newborns?
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What is the outermost covering of trees and some plants called?
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What are the tiny blood vessels that connect arteries and veins?
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How many pairs of ribs are in a typical human body?
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What is the shape of DNA called?
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What is the largest known spider in the world?
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How many bones are in the human body?
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What happens to your skin's blood vessels as you exercise?
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