Which part of an apple best represents earth’s crust (will mark brainliest! ) seed skin stem

I don't know much about bio, but for this your answer is skin. This is because it is the outer layer.

Hope this Helps!
~JaredEkey

The crust (i.e. the top layer of the earth's surface) is the thinnest layer of the earth. The skin is the thinnest layer of the apple, as well as its top layer, therefore the correct answer is the skin.