How did short term catastrophic events, such as volcanic eruptions and asteroid collisions affect the climate and biosphere?

What is one function of the embedded proteins

How do diseases caused by bacteria and diseases caused by viruses react to antibiotics?

Ascientist separates a population of mice into two groups. what would most likely increase the rate of speciation in this population. a. teach the two groups different tricks b. allow the two groups to breed with each other c. put the two groups in different environment d. have the two groups live in identical ecosystems