The cell membrane for it controls what materials should enter in and out of the cell
Explanation is in the file
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An internal skeleton is used to help an organism hold its body up and keep from falling, while a stem stores nutrients, and produces new living tissue, and transports fluids.
Hormones- Person's sex hormones as held to influence behavior or mood.<span />
The cell membrane is made up of a phospholipids that are arranged into two layers which are called lipid bilayer.
