A) are capable of surviving in harsh environmental conditions
B) Indicate presence of certain minerals in the soil
C) have become rare due to over exploitation
D) play an important role in supporting other species
Correct Answer: D
Solution :
Keystone species deserve protection because these have a significant and disproportionately large on the other species living in a community. The number of keystone species often low as compared to other species but they limit the population of other species. Removal or decrease in number of these species in a community causes serious disruption in structure and function of that community.
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