Compared to a solution of pH 9, a solution of pH 7

A. has no OH- ions.
B. is more basic.
C. has a higher pH.
D. has more H+ ions.
E. All of these choices are correct.


Answer: D

Biology & Microbiology

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On a road trip in the American West, you see a prairie dog town-a colony of related animals. There are hundreds of prairie dogs, but only a subset are scanning for predators at any time. If a predator is spotted, a prairie dog barks to warn the rest of the colony, who dart into their burrows. Prairie dogs have a complex vocabulary of alarm calls, which differ to indicate hawks, coyotes, or humans. What feature of group living is best illustrated by the prairie dog alarm system?

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