The giant short-faced bear disappeared completely from north america about 12 million years ago due to competition from smaller omnivorous brown bears which migrated from eurasia. which pattern of evolution does this example represent? a. coevolution b. phyletic gradulism c. extinction

Extinction  

Explanation:  

The process by which the total number of organism of a particular species die due to some natural cause or man made cause is known as extinction.It is a part of evolution.

Here, in this case the extinction of native species took place because they could not survive while competing with the invasive species. This lead to mass extinction of the giant short faced bear.

explanation:

the fossil record extends back to a dog-like ancestor some 55 million years ago, which gave rise to the first horse-like species 55 to 42 million years ago in the genus eohippus.

i believe the answer is a or 1