Question

What are the two most important processes in the cycling of oxygen in and out of the atmosphere?

a. weathering and erosion
b. evaporation and precipitation
c. photosynthesis and respiration
d. lightning fixation and fossil fuel emission

Answer 1

C.
It is C because photosynthesis uses CO2 to form O2 and respiration uses O2 to create CO2, both processes filter oxygen through the atmosphere.

Answer 2

Answer: Option C

Step-by-step explanation:

Photosynthesis is the process by which plants makes food by the help of the carbon dioxide found in the atmosphere. This process take place in the presence of sunlight.

The end product of this process is glucose with oxygen as a by-product. The oxygen is released into the atmosphere.

The oxygen is used by all the living forms of life on earth and the carbon dioxide is released out by the animals in the atmosphere by the help of the process known as cellular respiration.