Being heterozygous for the hemoglobin gene variant that causes the disease sickle-cell anemia can be advantageous in what situation?
A. in areas where malaria is endemic
B. when iron intake is too low in the diet
C. in elite athletes because it slightly decreases oxygen affinity
D. when a person has anemia caused by other factors
E. when a person is at high altitude
A. in areas where malaria is endemic
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What are the two structures that ensure the reproductive success of angiosperms?
a. flowers and fruit b. cones and leaves c. carpels and gametes d. radicles and cotyledons
Zero population growth is achieved when:
a. a population reaches the carrying capacity of the environment b. number of births is balanced by number of deaths c. births exceed deaths d. immigration exceeds migration e. migration is prevented
Which statement about chlorofluorocarbons is FALSE?
a. They can destroy ozone. b. They are odorless. c. They are a greenhouse gas. d. They break down very slowly. e. Their action is allowing more UV radiation through the atmosphere.
Which of the following appeared last in the evolutionary timescale?
What will be an ideal response?