Answer:
Hydroxyl
Explanation:
Hydroxyl groups are simple structures consisting of an oxygen atom with two lone pairs bonded to a hydrogen atom.
A hydroxy or hydroxyl group is a functional group with the chemical formula -OH and composed of one oxygen atom covalently bonded to one hydrogen atom.
Using these given definitions, a hydrogen bond is labeled with one linkage, while a covalent bond is with two links to the Carbon Atom.
See attached image for a similar diagram for proof.
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The only one correct answer would be:
c. Yellow or red hues in the soil indicate the presence of iron or aluminum.
Carbohydrates, fats, and proteins make a nutrient organic. water(H2O) and oxygen is considered organic. Hope it helps!! God bless you :)