Biology

What fluid-filled sac surrounds the human embryo?

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What are people suffering from Celiac disease allergic to?
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What name is given to the group of animals that a ladybug belongs to?
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Which pair of animal species and type is correct?
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Pregnancy in humans lasts how many days?
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Which of the following correctly names the top layer of the rain forest?
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Which of these animals below is extinct?
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Which of these animals is cold-blooded?
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Which of these is not part of a plant?
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