Sound waves travel the fastest through

Sound travels fastest through the SOLIDS

Explanation:

Since the density of solids is high and the molecules of a solid are closely packed, sound waves are quickly transmitted from one molecule to the next thus enabling it to travel faster. The speed of sound, therefore, is fastest in solids, followed by liquids (less dense than solids) and then gas (least dense).

clumped distribution, because you'de have all of the population gathered in a relatively small are.

it's the most common because it provides protection and a mate for reproduction

example: humans, seeweed, cattles, etc.

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%