Earths food chain starts with the sun then it goes to producers such as plants that absorbs the sun’s energy to produce their own “food”
Yes, it could be.
But there are also many other things it could be the result of.
Because they supply much energy to the food by preparing their own food because the above one can't prepare it own their own
Explanation:
The answer is mitochondria because this is the super producer of cell systems. while an active animal, (squirrel, rodents, horses, deer etc.) are all prey items for preditors, they possess more energy to survive & escape danger...
after the evolution of the first living cells, fermentation wasn't needed, because aerobic respiration was now doable, since there was more oxygen in the air now. also, as the temperature increases, it becomes more energy consuming to conduct fermentation over aerobic respiration.
Hope this helps :)