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Without cell specialisation, the organism can never become more than a simple protozoan because it's one cell must perform all of the metabolic functions to keep the cell alive and allow it to reproduce. It is the development of cells that work together to perform one function for the benefit of the entire colony of cells that allowed advanced animals and plants to evolve.

Eventually, some organisms developed highly specialized tissues that became organ systems, and so advanced animals with large bodies(mammals, for example) and advanced plants (trees, for example), also with large bodies, were able to evolve and thrive.

In our bodies, specialized tissues become organs with one main function, and we call these organs 'systems'. We have digestive, circulatory, respiration, reproduction, endocrine, nervous systems and more, all of which perform specific functions to support the entire body.

In trees, there is xylem tissue to bring water up from the roots to the leaves, phloem tissue to bring glucose down from the leaves to the roots, structural ring systems which allow the tree to grow tall and wide, etc so the result is a large plant with specialized tissues to support the entire tree.

The more specialized and seperate the systems, the more highly advanced the organism.

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