Greens are the most basic and prevalent life form on the planet. In the waters, the greens are represented in large and microscopic plant life such as phytoplankton, which grow abundantly in oceans around the world and are the foundation of the marine food chain. On land, the greens can be represented in many green plants and tree foliage with access to sunlight and water. They all contain the pigment chlorophyll for photosynthesis.