system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why so humans undergo several growth spurts and not just grow at a uniform rate?
gpt
To make sure all the other parts catch up. Certain things are easy and cheap in energy to grow, like soft tissues, skin, and hair. Other things, like bones, heart muscles, and important cells take a lot of energy and are created slowly to make sure less mistakes( ie cancer) are made such as creating more neurons. Your body builds certain structures like Bones in big spurts then lets the other stuff catch up. So your head and legs have to grow first before the other stuff can fill it in.