What can cause extinction of a species?
a) quick adaption to change
b)adaption that do not overcome challenges of the environment
c)adaptions that overcome challenges of the environment
d)having behavioral adaptions

Which of the following is a reason why early living organisms on earth could not have survived on the surface? 1. the lack of an ozone layer 2. the lack of oxygen in the atmosphere 3. the fact that these organisms were single-celled