List the four cellular structures common to both prokaryotic and eukaryotic
organisms.

a) Cell membrane:

Cell is the microscopic unit of life whether it be prokaryotic or eukaryotic cell, both have cell membrane to hold on the organelles inside it.

b) Cytoplasm:

Though cytoplasm is not an organelle but generic term that describes everything within the plasma membrane. It is a semi liquid plasmic substance which is filled in the closed cell membrane. Organelles are present in it. It acts as a reservoir for amino acids, and other nutrients used in the daily life of the cell.

c) Ribosomes:

It is a natural protein uniter. It weaves one amino acid to other to form long chains.

d) DNA: Deoxyribonucleic acid:

An extremely long set of molecules which is the most important ingredient of chromosomes and is the material which transfers genetic material in every living organism.

name and explain one of the event that occurs during meiosis that increases the variation in offspring even more than simple reproduction?