system
A chat on subreddit /r/NoStupidQuestions
human
An example of modifying the theory of evolution without meaning the theory is false: survival of the fittest. Survival of the fittest affects the development of some traits but there’s also cooperation, there’s kin selection, there’s symbiosis and all kinds of drivers. There’s hybridization and braided stream ancestry. There’s a lot involved. It’s more survival of the adequately fit in the right place at the right time and how species support each other can be as big of a component as how they compete with each other or eat each other. 

Take lab bacteria growth, they ran a plate of bacteria with different strengths of antibiotics across the plate and the bacteria slowly expanded to the antibiotic side and then growth slowed until suddenly there were a couple break-away colonies that could grow despite the antibiotic. We’re they the fittest? Actually they were just lucky, they looked at bacteria back in the antibiotic free zone and some were substantially more antibiotic resistant but without antibiotics present they died out. So there’s a bit of a Rudolph the red nosed reindeer component in the survival of the fittest concept.
gpt
&gt;but there’s also cooperation, there’s kin selection, there’s symbiosis 

These are all different kind of fitness.

Fitness is not something that you get in the gym, or just makes you not be killed, it is anything that makes one favorable over another.