Marine fish will (select all correct choices):
A. lose electrolytes across the skin and gills.
B. gain water across the skin and gills.
C. gain electrolytes across the skin and gills.
D. gain electrolytes from drinking.
E. lose water across the skin and gills.
C,D,E
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Human birth rate peaked in the 1980s and has been slowly declining ever since. How is this expected to affect our population size over the next several decades?
A. The human population size will level off. B. The human population size will continue to increase at the same rate it has for the past 100 years. C. The human population size will begin to decline. D. The human population size will continue to increase, but not as fast as before.
What are plasmids?
A. Small, circular RNA molecules that contain many genes but that cannot be passed on to other bacteria B. Small, circular DNA molecules that contain just a few genes and that can be passed on to other bacteria C. Small, circular RNA molecules that contain just a few genes and that can be passed on to other bacteria D. Small, circular DNA molecules that contain just a few genes but that cannot be passed on to other bacteria
A frog's immature stage is a tadpole; therefore, the development of a frog is
A. direct. B. indirect. C. incomplete. D. delayed. E. circumstantial.
The cavity between the body wall and the digestive tract is the
a. coelom. b. peritoneum. c. cecum. d. rectum. e. blastocoel.