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The respiration surface in humans is the alveoli. It is adapted to its function as a gas exchange surface because it has a high surface area to volume ratio, this allows maximum surface area for gas excha...

An autobiography is a story about a person's life, written by that person. Both a biography and a portrait are the impetus for autobiographies and autoportraits as without a « bios » there is no « auto »....

Being able to manipulate equations is a very useful skill in Physics. Consider, for example, the relationship between mass, density and volume.
m = ρ x v
In the above equation, the mass, m ...