5. Choose the best answer.

This cycle is between the environment and living organisms and does not involve the atmosphere.
phosphorus
nitrogen
potassium
carbon

The model illustrates a process by which a substance is taken up by a cell

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

Wich organism obtains its energy from dead or decaying matter