C is correct. the rest is either about food webs or about both food webs and food chains.
By geans that how your welcome
Suger is a type of carbohydrate
The waste products of respiration are Co2 and H20.
The solar system is considered a natural system because it was made and controlled by natural forces, meaning, it was never influenced with human creations. It is considered as one of the products of the phenomenon of the physical world. Hope this answer helps you.