What is the role of the greenhouse gases in the atmosphere? a) they trap some of the sun’s heat energy within the atmosphere, to maintain earth’s average temperature. b) they prevent most of the sun’s rays from reaching earth, thereby preventing earth from heating up. c) they divert the sun’s heat from the equator to the poles, causing the ice caps to melt, leading to global warming. d) they destroy the ozone layer, allowing harmful ultraviolet rays of the sun to reach the surface of earth.

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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population. population is the number of people or animals in a particular place. an example of population is over eight million people living in new york city.

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