Which term describes the systems of continuous water movement on and in the earth?
a. precipitation cycle
b. erosion cycle
c. hydrologic cycle
d. vapor cycle

How many species of living things are alive on earth today? more than 1,000,000 none of these answers are correct 100-500 1,000 –500,000 o 500,000 -1,000,000

The breakdown of food is accomplished by enzymes. a. physical b. chemical c. mechanical d. none of the above

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