Need answers fast
in the old west, a cowboy would put their ear on the railroad track to determine if a train was coming. using this method, they could tell if the train was coming sooner than just listening for the train.
a good explanation for this would be that
a)
sound and vibrations travel faster through gases than solids.
b)
sound and vibrations travel faster through solids than gases.
c)
sound and vibrations dissipate faster in solids than in liquids or gases.
d)
sound and vibrations are more concentrated in solids than in liquids or gases.

hope this !

hydroxyl -oh

alcohols, always polar, can form hydrogen bonds with h2o molecules

carboxyl -cooh  

cargoxylic acids, has acidic properties which is a source of hydrogen ions, found in cells in ionized for with a charge of oh-1

carbonyl > co

ketone if within skeleton, aldehyde if group is at the end of skeleton, k & a may be structural isomers, it determines 2 sugars (ketose & aldose)

amino -nh2

amines, acts as a base, it can pick up h+ ions from surrounding solution, ionized with charge of 1+

methyl ch2

addition to rna/dna affects and gene expression

phosphate -opo3 ²⁻

organic phosphates, contributes to negative charge to, molecule that it is a part of, and potential to react with h20

sulfhydryl -sh

thiols, cross-linking stabilize the protein, and it is structure

i believe the answer is snake.