cells
structures function.
cells are very unique creations.
They are the basic unit of living organisms.
They perform many functions.
Every animal,bird,insect and plant is comprised of millions of tiny cells.
Cells are essentially the building blocks of life.
Some of the first known cells were formed 1.5 billion years ago.
That is long before dinosaurs walked the Earth!
The main portion of all cells is filled with a fluid material or even extra water.
On the outside of all cells is a protective covering called a membrane.
It is just like the shell of an oyster.
Sometime cells divide in half, forming a new cell.
In other words, one cell splits in half and an exact duplicate forms.
Now there are two cells.
When we are growing as a baby, cell division is responsible for much of our growth.