Why do estrogen levels fall after menopause?:
a. The ovaries degrade.
b. There are no follicles left to produce estrogen.
c. The pituitary secretes a menopause-specific hormone.
d. The cells of the endometrium degenerate.
Ans: b. There are no follicles left to produce estrogen.
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The most prominent known role in the opening and closing of stomata is played by____ ions
a. Ca2+ b. Cl? c. K+ d. NH4+ e. Na+
Tarsiers, new world monkeys, old world monkeys, and apes are all living members of which of the
following mammalian lineages?
a. Strepsirhini b. monotremes c. Rodentia d. Haplorhini e. marsupials
Which features are required for efficient external respiration to take place?
A. The gases being exchanged must be present in a low concentration in order for diffusion to occur. B. The gas exchange region must be moist, thin and have a large surface area. C. Gas exchange can only occur at a temperature lower than the body temperature of the organism. D. The gas exchange needs to occur in an aquatic environment in order to be efficient. E. The gas exchange region must be dry, thin and have a large surface area.
After binary fission, daughter cells will differ genetically.
Answer the following statement true (T) or false (F)