Why can matter be cycled in the biosphere? Why is it important to organisms that matter is cycled in the biosphere?
How are the various nutrients removed and returned to the atmosphere?
What primary processes move nutrients in each cycle?

All eukaryotic cells contain small bodies called

Which of the following must be true for a fossil organism to be useful as an index fossil? a. the fossil organism must be widespread geographically. b. the fossil organism must be abundant. c. the fossil organism must be limited to a short span of geologic time. d. all of the above.

Drag the tiles to the boxes to form correct pairs. match the causes with their effects cause: tectonic plates at transform boundaries experience friction. cause: tectonic plates at transform boundaries experience friction. cause: earth is covered by a crust that runs miles deep.