The biosphere:
ends at the surface of the earth
extends miles below the surface of the earth
includes all the living organisms on the planet
all of the above
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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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the fossil record provides evidence of a common ancestor to many species.

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%