Based on scientific research, which statement best describes mutations? a. mutations are rare occurrences. b. mutations are always harmful. c. mutations cannot be inherited. d. mutations cannot be acquired.

Which blood cell spend most of their time in the lymphatic system?

The human body needs energy in order to carry out life processes such as breathing. where does the body get this energy? a. from eating food b. from learning about new things c. from lying in the sun d. from sleeping

These are the components of the reservoirs of carbon that are exchanged in our environment.