Which of the following is an abiotic factor of a desert?
a. cactus
b. sand
c. lizards
d. wildflowers

How can an organ, such as the lungs, work for multiple body systems?

Grasses--> mice--> cats--> coyotes suppose 10,000 units of energy are available at the level of the grasses. what is the total number of energy units lost by the time energy reaches the coyote?

The earth's oceans are made up of chlorine, and trace elements. a) carbon, oxygen b) oxygen, silicon c) hydrogen, oxygen d) nitrogen, oxygen