The endosymbiont theory explain that the mitochondrian and endoplasmic recticlum present in plant and animal are descendant of some symbiosis bacteria
The answer is b) bent angle
Answer:
Energy decreases as it moves up trophic levels because energy is lost as metabolic heat.
Explanation:
When the organisms from one trophic level are consumed by organisms from the next level. ... A food chain can usually sustain no more than six energy transfers before all the energy is used up.
I believe the answer you are looking for has to do with cells, they are the basic building block of life and are the smallest life that can support itself.