Answer:The ratio of surface area to volume is the most effecient size for them to fuction the best.
Explanation:
Species, genus, family, order, class, phylum, kingdom
"an advantage of gas exchange in fresh water, compared with gas exchange in air, is that water loss through evaporation across the respiratory surface can be minimized." The primary function of the lungs involving the transfer of oxygen from inhaled air into the blood and the transfer of carbon dioxide from the blood into the exhaled air.
It’s the last one - it is breathed out
Therefore they are consider matter. Remember anything with a mass is matter.