Because all organisms are made up of cells and there are different types of cells which carry different functions.
Surface area affects the function of an organ in the human body...
In our lungs, there are balloon like structures called alveoli.if we spread our lungs it equals to 80m^2. this large surface area allows lungs to take as much as possible oxygen to carrry respiration so that life processes go on.
HOPE IT HELPS YOU '_'
Choice B:
More photosynthesis leads to more oxygen in the atmosphere and oceans.
The number of organsims at each levels, so there are more producer than herbivores, more herbivores than carnivores and so on...
Breathing in air pollutants can irritate your airways. It may cause shortness of breath, coughing, wheezing, asthma episodes and chest pain. Overtime, exposure to air pollution puts you at risk for lung cancer, heart attack/strokes, etc. Some people are more at risks from others though