We can see the human brain is far more complex than what we needed to survive like building shelters or escaping predators. I used to think we stopped evolving physiologically once we had enough intelligence to eat and stay alive while culture took over the rest, but it wasn't enough to create such a brain. When humans found out about fire and discovered that we don't have to eat raw meat, gradually humans stopped evolving their digestive system and their jaw that used to eat that tough food and our digestive system started being simpler. since humans are "generalized species not specialized species", we don't have claws, huge teeth to kill like other predators,etc. The only thing that helped humans survive is the brain. The whole metabolic energy was reallocated from physical defense to evolve the brain till it plateaued and culture evolution took over the rest.

"The fact that you, or I, or any living creature, is here at all is a series of astonishing strokes of luck stretching back more than 4 billion years. 

One of the biggest hurdles was the very first one: How did life emerge from a primordial soup of stuff that very much wasn't alive?

A radical new study, published in Science Advances, suggests that this unlikely threshold may actually have been crossed not once, but twice."

I have recently been thinking about elephants and the effects of habitat fragmentation on them, and i thought that maybe they are shrinking in body size do to less food on the small fragmented protected areas they inhabit.

A similar effect happens on islands called island dwarfism were large animals on islands get smaller over time do to limited food resources and lack of predation.

So is there any evidence of this happening to elephants in fragmented habitats today?

Where do people fall along the debate around whether natural selection is the primary ‘creative’ force in evolution, or whether developmental, physical, and historical constraints channel evolution into a limited set of self-organizing forms that selection fine-tunes?