Question

define cell theorem​

Answer 1

your answer is ready..here

Answer 2

cell theory is very important topic...

now see,

Cell theory is a proposed and widely accepted view of how most life on Earth functions. Before the invention of advanced microscopes, microorganisms were unknown, and it was assumed that individuals were the basic units of life.However, in the 1800s, this view began to change thanks to the microscope. Microscopes allowed early scientists to view and postulate about the cells they could see. Even with a microscope, it is not always possible to see the exact functioning of a cell. Scientists formulated a general theory of how cells work that is very simple.

now you need what it's main statement,yes?

Cell theory has three major hypotheses:

First, all organisms are made of cells.

Second, cells are the fundamental building blocks used to create tissues, organs, and entire functioning organisms.

The third, and probably most important part of the theory is that cells can only arise from other cells.

here it is the short note about this...you can put some examples like

bacteria, which are single-celled organisms, divide in half (after they grow some) to make new bacteria.

I thought it is a good answer for you...