Fire ecology is... A. an old branch of science
b. a way for scientists to prevent accidental wildfires
C. the study of how fire affects ecosystems
d. all of the above

c

Explanation:

fire ecology is the study of the interaction between ecosystems and the wildfires that occur naturally within them.

they float because they are less dense than the water itself

something denser than water, like a rock, will sink to the bottom

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