Answer:
The cell membrane
Explanation:
This is the phospholipid bilayer that everything that wants to come into the cell has to move throught. It is also selectively permeable.
The information that may be shown in an ecological pyramid is the relative amount of energy.
A food pyramid is wider at the bottom, at lower trophic levels, showing that there is a higher amount of energy available to the producers, and this energy reduces as we move up the trophic levels of the ecosystem.
