The degree of adaptation to a specific environment is known as ________
a. adaptation
b. biogeography
c. directional selection
d. speciation
e. fitness
e
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The cardiac, pyloric, anal, and ileocecal sphincters are all part of the
(a) digestive tract. (b) respiratory tract. (c) circulatory system. (d) muscular system.
The first eukaryotic cells probably arose about ________ billion years ago.
A. 2.2 B. 4.5 C. 2.5 D. 3.5
The "scientific creationism" view includes all of the following beliefs except that
A. biblical account of the origin of the earth is literally true. B. the organisms did not change from their original appearance. C. all species of organisms were individually created. D. extinct species are replaced with new ones. E. the earth is much younger than most scientists believe.
The plasma membrane of eukaryotes contains all of the following except ________.
A. phosphoglycerides B. peptidoglycan C. sphingolipids D. sterols