system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do genetic variations work? Why are chimpanzees and apes remarkably different than us although we do share 95-99% DNA?
gpt
What most people don't realize is how much of the genetic code is required just for the most basic functions of life. It's like using libraries when writing an app - you can make very different apps just by shuffling around what you use from which library, while adding minimal code yourself.

Think stuff like making proteins, reading and copying DNA, reacting to the availability or absence of food, scheduling cells for division,....

All of that takes *a lot* of code and is basically the same everywhere.