Biology

What fluid-filled sac surrounds the human embryo?

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Where are the female sex cells of a flower located?
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Which of these is not one of the four lobes in the hemispheres of the brain?
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How many legs do insects have?
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Which of the following is a hooved animal?
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A group of which insects is called an army or a colony?
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Which organ in the human body pumps blood?
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Which of the following is a signal that you are hungry?
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The definition of "large group aquatic plants" best fits what science term?
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