They didn’t need it. The enlightenment thinking presented a philosophy that was opposed to the the idea that only a king could rule. They gave an revolutionary idea for it’s time. People didn’t have to accept it.
Food
In order to live.
oxygen
We can not live with out trees
humans don't need meat to live they can survive off of plants but would be very weak. meat gives you the protein that your body needs.
You don't need carbon dioxide to live...I think you're thinking of oxygen.
No you need a heart and a brain too...
For the exact same reason we humans need air: to live.
Well the things that humans do need are water/food safety shelter that's all what we really need.
Humans themselves do not use photosynthesis, but because humans depend on plants, as well as other animals that eat plants, in order to live, no, humans could not live without photosynthesis. Unless plants had another way to make food for themselves, humans could not live without photosynthesis.
Yes They do,Most Dogs Have it, But They Need It For The Same Reasons Humans Do.... So They Can Live
Bears, raccoons, humans (at least the prehistoric ones), etc.