An estser is the reaction product between: a. alcohol and organic acid
b. alcohol and oxygen
c. ketones and oxygen.
d. aldehydes and alcohol

An ester is the reaction product between A. alcohol and organic acid. 

Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.

Answerhave membrane-bound organelles;