what puts the most oxygen back into the atmosphere forest fires, life process of animals, weathering of rocks and minerals for photosynthesis

Deer cave cannot support photosynthesis is as not enough sunlight is present. in spite of this, it still has a complex food chain. what is the energy foundation of this food chain?

If jane has the blood type ab and marries john who has type o blood what are the possible phenotypes of their first kid?

What are examples of the plant life and animal life that can be found in each type of terrarium