What is a defining feature of mammals that is not present in most other vertebrates?

Which of the following is not a main characteristic that scientists focus on when determining which kingdom an organism belongs to

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

Compare the composition of the moon's surface with the composition of the earth's surface.