My computer has 98% the shape of a shoe box.
Dna is like… you start with a group project and every person adds a bit and that’s your new animal. The old instructions are not always deleted, just inhibited and a new instruction is applied. So you can end up with weird similarities between a banana tree and a human as they both still have that big chunk of initial instructions, most of which are not used and part of which do run the basics of how to make a cell and how to run things in a cell, which is already a lot of instructions. Once defined what is a living form, the part that defines shape and purpose of groups of cells is relatively little.
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