CAN SOMEONE PLEASE HELP ME WITH THIS SCIENCE QUESTION THANK YOU!! (Explain how you got the answer)

What is the relation ship between structure and function in an organism

As a small change in a person's dna can cause a genetic disorder

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