Answer:
this was sooooo long ago i forgot how to do this
Explanation:
The primary difficulty is the fact that we do not know all of the organisms that currently exist in the world along with those that existed in the past.
Answer:
I think it's c but I can't be for sure...
sorry if I'm wrong
Explanation:
No need for Brainlist I am probably wrong. I'm an idiot qwq