So we can easily classify animals and distinguish their relationships
Plasmolysis is the reason. The reason that the Elodea cell prevents from collapsing completely is that the Plasmolysis is the main reason because it always has water to keep it full. The answer in this question is Plasmolysis is the reason because it always has water to keep it full.
To primary consumers, as they directly eat producers and are next on the level of animals in an ecosystem.
Microscopic particles are called atoms.
