It's not a mole, it's a gene flow.
Onion (Allium) and Banana (Musa) are both eukaryotes and both have cell walls.
Answer:
The answer would be B, they are a source of clean energy.
Explanation:
Organisms get the energy they need from food just like us humans do.
Air passes through is: Nostrils → nasal cavity →Pharynx → Larynx →Trachea → Bronchi (with cartilaginous rings) →Bronchioles (without rings) → Alveoli (air sacs). Alveoli are the seat of exchange of O2 / CO2 between lungs and blood.