system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: From an evolutionary stance, why are humans bereft of basic defenses:claws, canines, thick hide..And instead runs with diverse body types, no fur, and exposed vital organs?

I accept evolution in its basic and complex forms, but how did humans dominate the jungle without even being able to hold their breath for more than two minutes, or getting a cold after every storm? Research tells me that the subconscious invested more time in perfecting precision and problem solving, but I can't help wonder if there are other theories.
gpt
A common misconception about evolution is that it should "improve things". 

In reality, though, it doesn't care where our organs are, or what defences we have. It simply favours animals that *learn to survive*. We have evolved from an ancestor of the Great Apes, for which this body structure was well-suited.

Humans have since done a remarkably good job of surviving/reproducing in our relatively-frail form, and so those are the genes that get passed on to the next generation.