It strains credulity to suppose that an unguided process of random variation sifted by natural selection could assemble such a delicately arranged system.
Only humans understand death as the inevitable and final reality for all mortal beings no matter what we do.
If an asteroid impact wiped out the dinosaurs as believed by the scientific consensus, its effects on evolution seem strained and inconsistent.
There is a long-running about whether birds first took off by running and flapping from the ground up, or whether they jumped as gliders from the tree down.
Researchers have detected something like REM (rapid eye movement) sleep — which is associated with dreaming in humans — in jumping spiders.