Biology
What forms the outer boundary of a cell and controls material moving in and out of the cell?
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What is the process of joining the male and female sex cells of a plant called?
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What embryological experiment was performed by Hilde Proescholdt?
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What are plants that grow, reproduce and die all in one season called?
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What organ filters blood and helps regulate salt and water levels?
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What is the fold of tissue that surrounds a mollusk's soft body?
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What hereditary disease allows large amounts of mucus to build up in the lungs?
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Which of these animals is closely related to sharks?
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