You are given a sentence and your task is to generate another sentence that supports the given input.

A mitochondrion contains two main membranes composed of phosopholipid bilayers and proteins -
Two membranes form the mitochondrion structure of a cell.

Corrosion is the gradual destruction of materials (usually metals) by chemical reaction with their environment.
Gradual degradation of a material due to its exposure to the environment is known as corrosion.

Territorial (ter ih TOR ee ul) The description of an animal that claims a particular area of land or water as its range or territory, and defends it against intruders.

Animals that defend their area are generally known as territorial.