Sentence:  <WSD>Greens</WSD> are the most basic and prevalent life form on the planet. In the waters, the <WSD>greens</WSD> 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 <WSD>greens</WSD> can be represented in many green plants and tree foliage with access to sunlight and water. They all contain the pigment chlorophyll for photosynthesis. 
Meaning of the word marked with <WSD> tags:  Green vegetables; edible plants or plant parts that contain chlorophyll.