I'm pretty sure your talking about Vertebrates
Through the process of photosynthesis, carbon dioxide is pulled from the air to produce food made from carbon for plant growth.
You didn't really provide any possible answers here. However, it's very easy to say that the responsible actors for impulse transmission across the synapses from one nervous cell to another nervous cell is what we call neurotransmitters. These are special molecules that can have different effects when binding onto the required receptor sites.
Question 4. Populations, communities. Question 5: Biotic factos