Yes it is.
Carbon dioxide goes through plants, which they turn into oxygen. Humans and animals take in the oxygen and breathe out carbon dioxide. Then it repeats.
I think it is the somatic nervous system.
Hydrogen or ionic is the answer. But I would go with ionic
Carbohydrates are food for plants. Plants make their own food (carbohydrates) through photosynthesis which occurs in the CHLOROPLASTS of all green plants and leaves.
