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Biology, 02.04.2020 22:30 durham953

A muscle cell contracts or expands when . A. actin and myosin filaments slide over each other B. axons transmit signals to chloroplasts C. xylem and phloem open and close D. cilia project outward from the cytoplasm

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A muscle cell contracts or expands when . A. actin and myosin filaments slide over each other B. axo...

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