The moon's period of revolution is 27 1/3 days, and its period of rotation about its axis is
27 1/3 days
33 1/2 days
29 1/2 days
30 1/3 days

Because of its structure the cell membrane is known as a phospholipid ? a. bilayer b. molecule c. fluid d. barrier

Which would happen if more forests were cut down? a. the nitrogen cycle would be stopped b. nitrogen would be fixed by bacteria more quickly c. the amount of co2 in the atmosphere would increase d. fossil fuels would build up in the soil c the amount of co2 in the atmosphere would increase

Did you know that a blue wales tongue weighs more than an elephant?