Why are cellular respiration and photosynthesis considered opposite processes?

What the theory that the sun goes around earth was replaced with the theory that earth goes around the sun this was an exaple of a

When a population split into two subgroups what is most likely to cause the subgroups to develop different traits?

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