Photosynthesis produces oxygen and water. Photosynthesis is the result of a cycle. Humans use oxygen for respiration, the product produced from human respiration is carbon dioxide. Then plants absorb carbon dioxide from the air and turn it into oxygen with photosynthesis, this goes on and on as a cycle.
Answer:
A: glaciers wearing down layers of rock
Explanation:
Hopefully this helps!
Bacterial pathogen can multiply quickly within a small space
I don't think the answer is A as that seems a bit drastic, I think it's C.
Soil, water and food are all nonliving reservoirs of infection
