This the respiratory system!
The major organ of the respiratory system is the lungs, and in the lungs the air gets divided among smaller and smaller tubes at the end of which the oxygen enters and carbon dioxide leaves the blood!
I think b. Proteins are polymers of amino acids is the correct answer
Answer:
What abiotic aspects of an ecosystem can be affected by biotic aspects?
animals digging in the ground adding to soil erosion
Explanation:
Abiotic factor that could be affected by biotic factor entails the digging of ground which aids soil erosion.
