Humans get energy indirectly from the sun, but directly through plants. plants get energy from the sun through photosynthesis, and we eat the plants.
I don't know answer to this question, but I can explain what it wants for you to name, if that would helped you.
It says that you have to find 4 doings of bacterias (micro-organisms) in the organ system for digestion.
If I'm not mistaking herbivores are primary consumers
A goes with T and G goes with C
the gases that kept different planta is A
