The respiratory systems of fish and birds are similar in that both________.
A. have similar partial pressures of oxygen in the environmental medium.
B. utilize air sacs.
C. have unidirectional flow of the environmental medium over the gas exchange surfaces.
D. employ countercurrent exchange.
Answer: C
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Global deforestation remains a major concern as huge tracts of rainforest are cut down each day. How does the removal of such large numbers of trees from the world's forests affect the concentration of carbon dioxide in the atmosphere?
A. The concentration of carbon dioxide increases, which has a warming effect on the climate. B. The concentration of carbon dioxide increases, which has a cooling effect on the climate. C. The concentration of carbon dioxide decreases, which has a warming effect on the climate. D. The concentration of carbon dioxide decreases, which has a cooling effect on the climate. E. The concentration of carbon dioxide remains unchanged, with no effect on the climate.
How many checkpoints are found along the cell cycle?
a. 1 b. 2 c. 3 d. 4
What are some effects of global climate change besides rising sea levels?
What will be an ideal response?
When the amount of water in soil exceeds what the pore space can hold, the soil is
A) at field capacity. B) at the wilting point. C) saturated. D) desiccated.