Sophia learns that the chromosomes in reproductive cells undergo a process called "crossing over," which allows for greater genetic variation in the reproductive cells. She constructs a partial model, as shown, to illustrate the process of crossing over.

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water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.