Scientists will be even more gobsmacked when they finally work out that this extinction event occurred only a few thousand years ago - like around 2348 BC
All your questions have probably already been answered by the highly qualified scientists who write for Creation.com
https://creation.com/
And if you are interested in genetics, look up Dr John Sanford. Here's a video that you might find interesting.
Back at you.
When is a PhD scientist not a scientist?
According to evolutionists, when a bona fide scientist is a creationist he ceases to be a scientist however many science degrees he holds.
Expand your thinking.