The edible part of the apple is the ovary wall. As a pay off to the animals that eat the apple, it contains nutrients.The animal then eliminates the waste, including the apple seed. The seed then begins to grow into another apple tree
The edible part of the apple is called the testa. This protects the seed and the cotyledons.
The colour of the apple attracts animals to eat it.
edit: about TESTA this is actually the seed wall (old wall of the ovule, usually inedible) edit your work then delete my comment
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