SAT Subject Biology Practice Question 148: Answer and Explanation

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Question: 148

18. In a long-running ecological study, the species richness of mosses, shrubs, and trees was calculated for one hectare (10,000 m2) of land every 50 years for 200 years. The data are shown in the table.

YEARMOSSESSHRUBSTREES
18001620
18502174
19001053
195013126
2000172814

What ecological process do the data suggest is occurring?

A. Evolution
B. Succession
C. Destabilization
D. Primary growth
E. Artificial selection

Correct Answer: B

Explanation:

Over time, this plant community shifts from one dominated by mosses to one with many tree species and an overall higher diversity. This shift indicates a forest undergoing succession or progression towards a stable climax community.

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