The moraines left when glaciers retreat are characterized by
A. rich, fertile soil.
B. high levels of nitrogen, phosphate, and carbon.
C. year-round ice.
D. low nitrogen content and little organic matter.
E. dense thickets of alders.
Answer: D
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Which of the following statements about the physiological responses of plants to increasing temperatures and carbon dioxide levels is false?
A. Many plants devote more resources to reproduction under these conditions. B. Many plants produce flowers earlier in response to increased temperatures. C. Many plants produce leaves earlier in response to increased temperatures. D. The amount of nitrogen in plant tissues declines in response to increased CO2. E. None of the answer options is false.
What is the most widely accepted and supported model for explaining the movement of phloem sap in flowering plants?
a. the translocation mechanism b. the pressure-flow mechanism c. the transpiration mechanism d. the cohesion-tension mechanism
The lymphatic system
A) provides an auxiliary route for the return of extracellular fluid to the circulatory system proper. B) acts as a "receiving" system for the allergic response. C) renders destruction of foreign bodies through chemical lysing. D) does all of the above.
Among the common features shared by prokaryotes and eukaryotes are
a. the same types of movement b. the same shapes and sizes c. ribosomes of the same weight d. common organic molecules such as proteins and carbohydrates