The membranes within the kidney tubules can be described as
a. pseudo-permeable.
b. impermeable.
c. semi-permeable.
d. permeable.
c. semi-permeable.
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In the United States, parathion is the most widely used member of a class of ____
a. organophosphate herbicides b. organophosphate insecticides c. chlorophosphate fungicides d. chlorophosphate herbicides e. chlorophosphate insecticides
Which of the following forms the skeleton of invertebrate chordates?
a. pharynx b. neural crest c. oral hood d. notochord e. cranium
Gametogenesis is the term for
A.) the production of gametes. B.) the fertilization of eggs. C.) the development of polar bodies. D.) the movement of sperm.
A population's survivorship curve is a downward-sloping straight line when:
a. the birth rate exceeds the death rate. b. the mortality rate increases with age. c. the mortality rate is constant regardless of age.