The body of the organism is composed of a singular cell.

Only the outer cells are specialized to face the environment. The inner cells are devoted to other functions.

Life span is long due to limited load of work for each cell type.

An injury of the cell can cause death to the organism.

Different cells are specialized to perform different functions.

The cell body is exposed to the environment on all sides.

Division of labor is at the organelle level. It gives a low level of operation efficiency.

The organism can attain a large size by increasing the number of small cells.

Life span is short due to the heavy load of work.

Only the outer cells are specialized to face the environment. Inner cells are devoted to other functions.

A single cell carries out the life processes.

Division of labor may be at the cellular, tissue, organ and organ system level. It gives a high degree of operational efficiency.

Injury or death of some cells does not affect the organism as the same cell can be replaced by a new one.

Cells have a double role - one for themselves and other for the organism.

Power of division is not lost.

A cell body cannot attain a large size because of the limit imposed by surface area to volume ratio.

The capacity of regeneration decreases with increasing specialization.

Certain specialized cells lose power of division.

A well-marked capacity of regeneration is present.

The cell has the same role for itself and the organism.

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