Alligators excavate holes in the bottom of bodies of water. During times of severe drought these holes act as refugia for various aquatic organisms that might perish if there were no water available. Thus, alligators in this system can be classified as a(n)
A. allopatric species.
B. symbiotic species.
C. sympatric species.
D. keystone species.
E. refugistic species.
Answer: D
Biology & Microbiology
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