Final answer:
In population ecology, a closed population consists of organisms that are isolated and do not interbreed with other populations. An example of a closed population is wild pigs living on an isolated island.
Explanation:
In population ecology, a closed population refers to a group of organisms that are isolated and do not interbreed with other populations. An example of a closed population from the given options would be option A, where some wild pigs live on an isolated island. The wild pigs on the isolated island represent a closed population as they are restricted to interbreeding within their isolated group.
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