Name three major layers between earth's center and 20 km (kilometer) above earth's surface.

If the birth rate of a population of dolphins is 2.0, the death rate is 0.5, and the population size is 100, what is this dolphin's population growth?

One important development during the 3rd trimester that will insulate the infant against changes in temperature is a. the deposition of fat under the skin b. the closing of the septum between c. the atria of the heart d. the beginnings of lung functioning e. the beginnings of light and sound sensing

Methane gas created by a cows flatulence especially in a large herd is a greenhouse gas. true or false.