Here's why:
* Elodea is a plant: Plants are multicellular organisms, meaning they are composed of many cells working together.
* Visible structure: If you look at an Elodea plant under a microscope, you can clearly see that it is composed of many different types of cells organized into tissues and organs (like leaves, stems, and roots).
* Specialized cells: Elodea cells have specialized functions. For example, there are photosynthetic cells in the leaves, vascular cells for transporting water and nutrients, and root cells for absorbing water.
While Elodea is a simple plant, it's still made up of many cells, unlike single-celled organisms like bacteria or amoeba.
