What relationship exists between changes in the environment and variations? A. Changes in the environment cannot influence the fitness of an organism. B. Changes in the environment cannot change which traits are advantageous. C. Changes in the environment can act only on existing variations in a population. D. Changes in the environment can only cause new variations to appear.

answer; i believe the correct answer is (sporophyte);

the dna molecules have a negative charge because of the phosphate groups in their sugar-phosphate backbone, so they start moving through the matrix of the gel towards the positive pole. power is turned on and dna fragments migrate through gel (towards the positive electrode).

explanation:

here is the answer

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.