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Simplest system:

     Epithelial cell

     Epithelial tissue

     Small intestine

     Digestive system

     Body

Complex system

Explanation:

as you progress each level down, the systems grow in the number of cells/functions that they do as one

[content deleted] - user123802726recklesschicken

succession returns a disturbed

ecosystem to a more stable state. this is also classified into two (2) types:

primary succession and secondary succession. the primary succession arises when

a new land is transformed and a bare rock has been exposed providing an environment

that can be occupied for the first time. while, secondary succession occurs

when a previously occupied environment was disturbed that kills much of all its

community

explanation: