Put the Following in Order from Simplest to Most Complex $\gamma$

Put the following in order from simplest to most complex.

A) individual $\gamma$ ecosystem $\gamma$ community $\gamma$ population
B) individual $\gamma$ population $\gamma$ ecosystem $\gamma$ community
C) individual $\gamma$ population $\gamma$ community $\gamma$ ecosystem
D) individual $\gamma$ community $\gamma$ population $\gamma$ ecosystem
E) individual $\gamma$ community $\gamma$ ecosystem $\gamma$ population