Answer:
DNA or RNA
Explanation:
There are a number of similarities between viruses and cells. Both are too small to be seen with naked eyes and require a microscope for observation. Both contain genetic material, in the form of DNA and/or RNA. Both of them can replicate, that is, produce more organisms similar to themselves.
I would think that is the red blood cell. I could be wrong so correct me if I am.
The Calvin Cycle produces glucose and the Krebs Cycle uses that glucose to synthesize ATP.
I don't know your options but hopefully that can help :)
cell wall , and a large central vacuole
drought, smog, flooding, volcanic eruption, blizzards, and pollution