what is true of mass
extinctions?

there is no evidence for past mass extinctions.

in each mass extinction, over 50% of animal species died.

mass extinctions happen frequently.

all life on earth dies when a mass extinction happens

Imagine that you’re getting ready to move to a new city. when people move, they are influenced by push factors and pull factors, and you have many reasons for your move. which of the following factors is an example of a pull factor? a. wanting to move because you’ve found a great new school somewhere new b. needing to move because there are not enough resources in your old hometown c. being forced to move because your old home is gone d. having to move because there are no jobs in your current hometown

What are the two largest greenhouse gases

Witch two conditions can limit the usefulness of the kinetic molecular theory in describing gas behavior?