In my opinion
Mass extinctions happen because of climate change, asteroid impacts, massive volcanic eruptions or a combination of these causes. One famous mass extinction event is the one that lead to the extinction of dinosaurs, 65 million years ago.
I hope it’s help
Answer:
complement is a system of plasma protiens that can be activated directly by pathogens
Before a cell divides DNA replicates itself. hope this helps!
I think bread; i’m 90% sure
