Question

What caused the mass extinction 65 million years ago that caused 75% of all species of plants and animals disappeared within a few million years?

Answer 1

An asteroid impact.

Step-by-step explanation:

An asteroid impact is considered to have tossed rubble across the earth, killing off many species of plants and animals, 65 million years ago. Volcanic activity is involved in at least four mass extinctions, whereas an asteroid in just one.