The cell is the individual unit of life. It evolved over long ages and
is pretty good. It has many fantastic tricks. It can even reproduce
by splitting in two!
However, there is a problem. Cells work better if small. This is because if small, oxygen and other substances can come in and out
easier being right near the cell boarder.
Cells evolve toward higher function. Some have tails to swim, mouth
like parts, eye spots. But..they must contend with the basic fact..
cells work better if small.
So how can bigger, higher functioning animals be made?
The solution is to have an animal made of cells working together.
This has many advantages: Cells can specialize. New animals can
be made with a rearraigement of cells following similar plans.
Cells can die and be replaced without much disruption to the
whole animal.
So, we are to made of a union of cells. We must understand ourselves
as a collection of cells which have mostly given up their independance
for a better existance in a place created by their collective efforts!
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