How did the ccc watson improve his life?

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.

This is collection of data made by comparing objects in standard units. in science, the units are metric.

Match each description of an object’s motion with the position-time graph that represents it. not moving moving with constant speed speeding up slowing down