It's important to understand that there were many extinction events throughout the history of the earth. Just in the world of Foraminifera there were at least s

It's important to understand that there were many extinction events throughout the history of the earth. Just in the world of Foraminifera there were at least seven catastrophic events which wiped out all or most of entire genetic lines. Some do survive, and over millions of years they can repopulate areas, but the resurrection will not happen one one hundredth as quickly as the destruction does, and it very well may not look anything like what exists now.