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During which period did mammals first appear? a. pleistocene b. carboniferous c. cretaceous d. jurassic
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Place the steps tor the formation of the enzyme pepsinogen in correct order
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When does the circulatory system work with the respiratory system? a. during blood cell formation b. during cellular respiration c. during intestinal digestion d. during a viral infection
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In a lab, scientists grew several generations of offspring of a plant using the method shown. what conclusion can you make about the offspring? a. they formed from meiosis and mitosis. b. they have half the number of chromosomes as their parent. c. they have low genetic variability among them. d. they will be able to reproduce only after they grow flowers.
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During which period did mammals first appear? a. pleistocene b. carboniferous c. cretaceous d. jura...
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