How would you best explain the existence of a mountain range that has abundant conifer trees, ferns, and mosses on the east side, but only sparse shrubby plants on the west side?
A. Differences in solar intensity produce the differing plant communities.
B. Adiabatic cooling leads to temperature gradients that produce the differing plant communities.
C. Differences in the specific heat of the two sides of the mountain produce the differing plant communities.
D. Precipitation differences due to a rain shadow on the west side produce the differing plant communities.
Answer: D
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Diffusion occurs because
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Figure 10.1 represents a Petri plate. The gray area is where bacteria A is growing, the black area is where bacteria B is growing. The white area is a zone where neither organism is growing. What is the best interpretation of what is observed on the plate?
A. Bacteria B is producing an antibiotic that inhibits the growth of bacteria A. B. Bacteria A produces a compound that inhibits the growth of bacteria B. C. Bacteria A grows faster than bacteria B. D. Bacterial colony B has depleted the nutrients in the area around the colony. E. No conclusion can be made from this information.