What goes in here
to start cycle

 to start what cycle

Explanation:

Photosynthesis requires sunlight, carbon dioxide, and water as starting reactants (Figure 5.5). After the process is complete, photosynthesis releases oxygen and produces carbohydrate molecules, most commonly glucose. These sugar molecules contain the energy that living things need to survive.

Explanation:

is in the form atp or adenosine triphosphate

b. lithosphere, asthenosphere, mesosphere   is the answer most likely