Large blood vessels that supply the spongy tissue of
the penis are __________ in an unaroused male.
a. vasodilated
b. vasoconstricted
c. secreting prostaglandins
d. volume reservoirs
e. inhibiting testosterone secretion
Answer: b
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Most of the water vapor in the earth's
atmosphere comes from evaporation from a. lakes. b. rivers. c. land. d. oceans. e. plants.
What is an evolutionary reason why individual ferns may produce millions of spores?
A) Having many spores increases the chances that they will produce fossil fuels. B) Having many spores increases the chances that they can produce seeds. C) Spores can germinate only in the right environmental conditions, so producing many spores increases the chances that at least one will end up in an area of those conditions. D) Spores can disperse only short distances, so producing many spores increases the chances that at least one will travel far enough to germinate.
Answer the following questions true (T) or false (F)
1. Equilibrium species are usually limited by density dependent factors. 2. Life tables are used to predict how many individuals will be born in any specific year. 3. Total human fertility rates have dropped globally in the past 50 years.
In a process called __________ , the cell pinches in half, with one complete set of chromosomes in each half.
Fill in the blank(s) with the appropriate word(s).