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A leaf on a tree,
What is a leaf?
The leaf is an above ground organ of a plant that is important in the production of food (through photosynthesis).
Leaves collect sunlight and also help the plant to exchange gasses (oxygen and carbon dioxide) with the atmosphere.
Leaves come in many shapes, sizes, and colors, and these are mostly determined by the environment in which the plant lives. Some plants, such as mosses do not have true leaves. Cacti have leaves that have evolved into spines that do not engage in photosynthesis.
Because food is produced in leaves, many animals eat leaves to get nutrition (folivores). These include koalas, iguanas, and caterpillars.