Here's why:

* Visible Structure: Elodea is a type of aquatic plant. You can see its leaves, stems, and roots with the naked eye, indicating it's composed of many cells working together.

* Specialized Cells: Like all plants, Elodea has specialized cells for different functions:

* Leaf cells: Perform photosynthesis and other metabolic processes.

* Stem cells: Provide structural support and transport water and nutrients.

* Root cells: Anchor the plant and absorb water and minerals.

Single-celled organisms, like bacteria or amoeba, are microscopic and cannot be seen with the naked eye. Elodea, being a visible plant, is clearly a multicellular organism.