The ancestor of humans is commonly thought to be
A. Australopithecus boisei.
B. Australopithecus anamensis.
C. Australopithecus africanus.
D. Australopithecus afarensis.
Answer: D
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Which of the following statements about childbirth is false?
A. Babies are usually born head first with the face pointing upward. B. The placenta is expelled as a result of muscular contractions of the uterus. C. The baby goes through a series of movements to facilitate its passage through the pelvis. D. Caesarian sections involve the removal of the baby through an incision in the abdomen and uterus. E. None of the answer options is false.
A carbon atom with six protons, seven neutrons, and six electrons has a mass number of ____
a. 6 b. 7 c. 12 d. 13 e. 19
There are more insect species per square kilometer in
a Brazilian rainforest than there are in a redwood forest of the Pacific Northwest of the United States. An explanation for this finding is that a. the tropics have conditions that more species can tolerate. b. species richness may be self-reinforcing. c. tropical communities have been evolving for a longer time than temperate ones. d. the tropics have conditions that more species can tolerate. and species richness may be selfreinforcing. e. the tropics conditions that more species can tolerate, species richness may be selfreinforcing, and tropical communities have been evolving for a longer time than temperate ones.
Cephalosporins are NOT
A) wide spectrum antibiotics B) antibiotics with few side effects C) disruptors of cell membrane function D) used prophylactically in patients undergoing surgery