Definition
*Volvox* is a genus of green algae that forms spherical colonies, often visible to the naked eye. These colonies are composed of numerous individual cells, each with two flagella that coordinate to propel the entire colony through the water. *Volvox* is commonly found in freshwater habitats, such as ponds and ditches. It's a model organism for studying the evolution of multicellularity. Imagine it as a tiny, rolling green planet made of individual cells. Each cell is like a tiny citizen contributing to the colony's well-being.