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Structure of the plant derived from the ovarium, and ocasionally by nearby structures, that bears the mature seeds.
The fruit have 3 distinct (or sometimes indistinct) layers, from outside to inside:
Epicarp (the peel): the outter layer may be hard or soft, usually very thin. In lots of fruits, itīs shiny and colorful.
Mesocarp: the intermediate layer is very often fleshy and juicy, and in most edible fruits itīs the main edible part. Itīs very reduced, almost absent in dry, capsular fruits.
Endocarp: the inner layer, surrounding the seeds, is often more resistant than the mesocarp, even though it may be fleshy, or very thin in some edible fruits, like guavas, grapes, mellons. In some cases, like peaches, almonds, hazelnuts and nuts in general, the endocarp is a very hard, resistant shell that surrounds the seed.