In many parts of the Amazon Basin, farmers have cut down the tropical rain-forest trees and planted crops. However, the farmers often abandon these croplands after a few years and move on. What are some possible reasons for this?
What will be an ideal response?
Soils in the tropical rain forest are very poor in nutrients, in part because the nutrient capital of the forest is tied up in vegetation. Even if the trees are burned to release nutrients, the abundant rains quickly wash the "fertilizer" away.
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The microorganisms that recycle nutrients by breaking down dead matter and wastes are called ________.
A. decomposers B. prokaryotes C. eukaryotes D. pathogens E. fermenters
Coral reefs, atolls, and islands are the result of the buildup of coral
a. polyps. b. medusae. c. exoskeletons. d. wastes.
When a cell membrane engulfs fluid droplets it is called:
A. receptor-mediated endocytosis B. phagocytosis C. osmosis D. pinocytosis E. diffusion
McFarland turbidity standards are composed of which substances?
A. ferric chloride B. magnesium sulfate C. barium sulfate D. sodium chloride