A scientist finds a fossil that she thinks might make a good index fossil. Which characteristic does this fossil most likely have?
It is the remains of an organism still found alive today.
O It is the remains of an organism that is found in abundance nearby.
It is the only fossil for this type of organism that has ever been found.
O It is the remains of an organism that lived in a narrow geographic area.

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

age range would be the answer

idk lol use google m8