The key point in Darwin's proposal is that the ___________ imposes the conditions that determine the direction of selection.
A. gene
B. environment
C. parent
D. individual
B. environment
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The number of circuits in the circulatory systems of humans is
(a) one. (b) two. (c) three. (d) four.
Cardiac muscle fibers differ from skeletal muscle fibers in that only the
a. cardiac fibers can contract without neural stimulation. b. skeletal fibers are striated. c. cardiac fibers contain glycogen. d. skeletal fibers are connected electrically. e. cardiac fibers are arranged in motor units.
A unidirectional process where a specific compound released by one organism has a negative effect on another organism is called ________.
A. amensalism B. negative cooperation C. commensalism D. predation
How has modern technology helped to produce new types of vaccines?
What will be an ideal response?