Which statement best sums up our understanding of how animals navigate during migration?
A. We have a thorough understanding of orientation but not navigation.
B. Animal navigation is a complete mystery.
C. The mechanisms have been worked out in great detail, from the genes involved, to the brain structures, to the resulting behavior.
D. We have some understanding of the information different animals rely on (sun, stars, or magnetic fields), and some sensory structures, but beyond that the mechanisms are still mysterious.
Answer: D
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A mountain range along the coast of a continent is located perpendicular to the prevailing sea breeze. Which one of the following describes an area where the rain shadow is located?
A. on the leeward side of the mountain where cool, dry air is descending B. on the leeward side of the mountain where warm, moist air is descending C. on the windward side of the mountain where warm, moist air is rising D. on the windward side of the mountain where cool, dry air is rising E. on the leeward side, far inland from the mountain
Over the past 100 years, the decrease in deaths due to infectious disease has been somewhat offset by an increase in death due to metabolic diseases.
Answer the following statement true (T) or false (F)
Polyandry is the mating system in which ____
a. one male and one female form a long-term association b. both males and females mate with multiple partners c. one male mates with many females d. one female mates with many males e. both males and females provide care to offspring
Which of the following is NOT true of cytokinesis?
A. Cytokinesis is the division of cytoplasm and its contents. B. The formation of a cell plate in plants results in cytokinesis. C. The formation of a cleavage furrow in animals results in cytokinesis. D. Cytokinesis occurs during interphase.