Assuming the death rate remains constant, how many cubs must be born each year to reach the tiger’s MVP of 5,000 tigers in two generations, or 25 years?

Did you know that a single bee would have to go to over 2 million flowers to make a single pound of honey?

Moving down the ramp from 6 meters to

Which line in the graph above best illustrates an effect of the carbon dioxide level in the blood on breathing rate before, during and after a period of exercise? 1.b,2.c,3.a,4.d