I think that the correct answer is C
Answer: C). Photosynthesis depends on the presence of carbon dioxide.
Explanation: Photosynthesis is a process by which green plants use chlorophyll to manufacture their own food in the presence of carbon dioxide, water and sunlight. The products of photosynthesis are glucose and oxygen.
I believe that the answer is an ecosystem
Mitosis is a step...which
further contains 4 steps each..
so the answer should be 4 steps..
mark brainliest if it helps