what exactly does herd immunity mean?
A. A community giving a herd of animals a disease.
B. When a lot of people heard the diagnosis.
C. When a large part of an area is immune to a disease.
D. None of the above.
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Other quiz: Ecology
The graphs below show the changes in crab color at one beach.
Which of the following is most likely to have caused the change in the distribution?
A. A new predator arrived that preferred dark-tan crabs.
B. A new predator arrived that preferred light-tan crabs.
C. A change in beach color made medium-tan crabs the least visible to predators.
D. A change in beach color made medium-tan crabs the most visible to predators.