When a patch of land is cleared in a tropical rainforest, the vegetation is often burned to enrich the soil with nutrients from the burned plant material. What description applies to this situation?
A) This works well because so many nutrients are trapped in tropical plants.
B) This works for a few years, but the soil is soon depleted of nutrients.
C) This isn't necessary because tropical soils are filled with nutrients.
D) This helps to promote long-term sustainable agriculture.
B
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Why is an estuary considered an intermediate biome?
A. It is the transition zone between freshwater and saltwater biomes. B. It will seasonally dry up and cease to be a biome. C. It is only a biome during high tide. D. It is intermediate in size, smaller than the largest biomes but larger than the smallest biomes.
Which of the following hypotheses is the most current and accepted one with regard to modern human origins?
A. the multiregional hypothesis B. the out-of-Africa hypothesis C. the convergent hypothesis D. the single regional hypothesis
Cholesterol is essential for keeping cell membranes from thickening
Indicate whether the statement is true or false.
Which colours are bees attracted to?
a. green and red b. green and blue c. yellow and red d. yellow and blue