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Aseries of connections of food chain in an ecosystem is called a what
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Blood has traveled from the heart to the toes. which describes the next step of the circulation process?
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Match the examples to the correct level of organization. 1. system level roses, snakes, puppies 2. organism level roots, stamens, leaves 3. tissue level bone, cartilage, blood 4. organ level heart, veins, arteries
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Which of the following statements about archaea and bacteria is true? a. neither is single-celled. b. they both have nuclear membranes. c. neither reproduces by binary fission. d. they both lack a nuclear membrane.
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Explain one reason that scientists believe that all life evolved from a single common ancestor...
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