Information obtained from the fossil record sets the background rate of extinction per year at species out of every million species.

Suppose you are estimating the size of a blue crab population. what is the population size if the number marked in the first catch is 40, the total number in the second catch is 200, and the number marked in the second catch is 50?

The normal shape of an enzyme is as shown in structure a. if the enzyme’s shape changes to that shown in structure b, what are two consequences of this change?

What happens to the average kinetic energy of water molecules as water freezes?