Which of the following situations describes an object's kinetic energy being converted into gravitational potential energy?
a ball rolls up an inclined ramp.

a penny sits motionless atop a shelf.

a kiwi is dropped from a second-story window.

a water particle flows down a mountain stream.

What molecule contains an organisms genetic material, passed down from parents to their offspring

Which of the following is a period in the paleozoic era? devonian cambrian permian all of the above

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.