Membranes that line the tubes and cavities of the digestive, respiratory, and reproductive systems are
called
a. mucous.
b. dense, regular.
c. desmosomes.
d. apocrine.
e. serous.
A
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What is the most appropriate term for a mature pollen grain?
a. megaspore b. microspore c. male gametophyte d. female gametophyte e. immature sporophyte
Many scientists feel that we are headed toward another mass extinction because of man's actions and our effect on the ecosystem Earth. What have we learned from previous mass extinctions that may provide an idea of the consequences of such a mass extinction? What should man do to try to prevent such an occurrence?
What will be an ideal response?
Where on this phylogenetic tree of primate evolution do you find evolution of the hominines?
A. No. 1 B. No. 2 C. No. 3 D. No. 4 E. No. 5
The Clean Air Act of 1990 was important because it specifically
A. stated that all politicians would from then on be pro-environment. B. detailed ways of making our air crystal clean by the year 2000. C. required scrubbers on smokestacks of coal-fired plants. D. punished polluters.