The species confined to a particular region and not found elsewhere is termed as

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endemic

alien

rare

keystone

answer is A.

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Detailed Solution

Endemic species are those that are native to a particular geographic region, and they are not found anywhere else. These species are usually restricted to a particular habitat, and their distribution is limited by geographic or ecological barriers. For example, the koalas are endemic to Australia and the giant panda is endemic
to China.
(2) Rare species may occur in various locations, and they may not be confined to a particular region.
(3) Keystone species are those species that have a disproportionately large impact on their ecosystem, relative to their abundance. They are not necessarily confined to a particular region.
(4) Alien or invasive species are those species that are not native to a particular ecosystem, and they have
been introduced to it by human activities. They may occur in various locations, and they are not confined to
a particular region.

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