In science, a theory is an explanation for some phenomenon that is based on
observation, experimentation, and reasoning. one important theory in biology is the
cell theory. what kinds of observations led to the development of the cell theory?
a. testing of first vaccines
b. discoveries of fossil bacteria
c. isolations of dna and rna
d. microscopic views of plants and animals

Microscopic Views of Plants and Animals

Explanation:

Robert Hooke invented the microscope, but onserved nonliving cells. Antony Leehwenhoek observed the first living cells and contributed to cell theory.

i think it is true in my reasonment ..

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