What is the adaptive value of having the organ of gas exchange (the alveolus) inside the body?

For gaseous exchange and energy distribution

Explanation:

they give the lungs a really big surface area.

they have moist, thin walls (just one cell thick)

they have a lot of tiny blood vessels called capillaries

carbohydrates: (starches and sugars) composed of carbon, hydrogen, and oxygen.

lipids: (fats, oils, and waxes) are made of carbon and hydrogen atoms.

nucleic acids: contain hydrogen, oxygen, nitrogen, carbon, and phosphorus. they are polymers of nucleotides. a nucleotide has three parts, a 5-carbon sugar, a phosphate     (-po⬇️4) group, and a nitrogenous base.

proteins: made up of nitrogen, carbon, hydrogen, and oxygen. they are polymers of amino acids.

a

explanation: