Primary production is generally highest in
A. taiga.
B. temperate rain forests.
C. temperate oceans.
D. tropical rain forests.
E. tropical oceans.
D. tropical rain forests.
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Why was it informative for researchers to study the proximate causation of Daphnia switching reproductive tactics in the laboratory?
A) Daphnia in the wild were genetically identical and the laboratory was the only place where Daphnia would reproduce sexually. B) Daphnia could not obtain enough energy in the wild to reproduce sexually. C) Daphnia were no longer available in the wild when the investigations occurred. D) Daphnia were never under high crowding conditions in the wild.
Which of the following processes is not one that is common to all symbionts?
A. Reproduction B. Persistence C. Predation D. Colonization
Which of the following is NOT an effect of global
warming? a. an increase in global photosynthesis b an increase in atmospheric CO2 levels c. a probable increase in extinction of species d. changes in temperature and precipitation patterns e. changes in plant and animal life cycles
The cardiac skeleton
A. forms fibrous rings around the atrioventricular and semilunar valves. B. serves as electrical insulation between the atria and ventricles. C. provides a rigid source of attachment for cardiac muscle. D. provides solid support for the heart valves. E. has all of these characteristics.