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Single events or several causes working together to produce extinction in a short period is referred to as mass extinction.

Example:
Destruction of forests, mountains, and bodies of water to satisfy human needs result to the imbalance of nature which also give rise to global warming.

Animals and plants have lost their habitats. They lost their means to live. They lost their food sources and they suffer and die because of humans irresponsible acts.

The base or root of a phylogenetic tree is where a population either becomes extinct or is currently living today.

This statement is true. 

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