The ________ is the respiratory center that appears to facilitate the transition between inspiration and expiration.
A) ventral respiratory group
B) central pattern generator
C) dorsal respiratory group
D) pontine respiratory group
E) medullary respiratory group
Answer: D) pontine respiratory group
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Natural selection exerts little or no effect on traits that appear during an individual’s ____
a. preadolescent years b. embryonic development c. juvenile phase d. postreproductive life e. reproductive life
Which factor is most responsible for the rapid population explosion of humans?
a. more prevalence of microorganisms to fight diseases naturally b. increasing availability of natural resources c. decreasing migration of human and animal populations d. decline in death rates without an equivalent decline in birth rates e. advances in reproductive technology
Which species shows the first solid evidence of bipedalism?
A. Australopithecus afarensis B. Ardipithecus ramidus C. Sahelanthropus tchadensis D. Homo habilis
The average amount of time that passes between the birth of a woman and the birth of her child is called:
A) reproductive time. B) birth rate. C) generation time. D) population rate.