The answer is B It must be testable.
The common carotid arteries and the vertebral arteries
It is supposed to flow through so heterotrophs(like humans etc) can gain energy from plants(autotrophs) which other animals gain energy from them eating each other which follows the food chain. Which keeps the food chain and life in order, by giving energy for work and life to sustain.
Lipid is a fat and can be used as an energy reserve.
Hope this helps!!
The answer should be B may be wrong
