The b horizon is

a. rockier than the c horizon
c. less nutrient rich than the a horizon
b. richer in humus than the a horizon
d. thicker than the c horizon

less nutrient rich than the A horizon

Explanation:

B horizon is the layer of the soil present below the uppermost horizon (the A horizon). B horizon is characterized by the presence of lesser amount of humus as compared to the humus present in A horizon. The lesser humus content in B horizon makes it less nutrient-rich compared to the A horizon. B horizon is a hard and compact soil layer.

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

by drinking easy

very easy