Can someone please help this is a Ecology quiz

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

What materials must dams have to produce electricity, and what must occur?

Describe the relationship between isotonic solutions, equilibrium, and water movement into and out of a cell.