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the protist ____________ have a contractile ribbon in the stalk and a large macronucleus that contains multiple copies of its genes.

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Final answer:

The Paramecium protist has a contractile vacuole for osmoregulation and a large macronucleus that contains multiple gene copies, which is central to its cellular function and asexual reproduction.

Step-by-step explanation:

The protist Paramecium have a contractile vacuole in the stalk and a large macronucleus that contains multiple copies of its genes. Paramecium have a distinctive cellular structure with two types of nuclei: the macronucleus for asexual reproduction and metabolic functions, and the micronucleus for sexual reproduction. The contractile vacuole plays a role in osmotic regulation, expelling excess water from the cell to maintain salt and water balance.

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