Endocrine, reproductive, and excretory systems?

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 is a group of organisms that are closely related and share similar characteristics

Crossing over and independent assortment are important activities that occur during meiosis. what is the significance of these activities