The first true hominids in the fossil record are
(a) Australopithecus.
(b) Homo habilis.
(c) the chimpanzee.
(d) Homo sapiens.
(a) Australopithecus.
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What factor is a major reason for the success of reptiles?
a. Amniotic egg b. Rearing of juveniles c. Advanced circulatory system d. Skin covered with tough scales
Inflammation begins when mast cells in tissue release __________, which increases blood flow and
also makes capillaries leaky to phagocytes and plasma proteins. Fill in the blank(s) with the appropriate word(s).
What gas makes up the majority of the atmosphere?
a. oxygen b. water vapor c. carbon dioxide d. nitrogen e. methane
What would happen if the cortical reaction proceeded before the acrosomal reaction was complete?
A. Multiple sperm would fertilize the egg. B. This is the normal situation. C. Twins may form. D. Fertilization would not occur.