According to the theory of plate tectonics, which forces cause the movement of plates in the earth's crust? a. convection and gravity b. earthquakes and volcanic eruptions c. magnetism and energy from solar radiation d. convection and the moon’s gravitational pull

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Moving down the ramp from 6 meters to

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.

Due tonight 10 points will mark brain