WTF?!!!
How frustrating you feeble theists are...
I'll let you in on a little secret; the flintstones wasn't historically accurate!!!
Heres the rough history of life on earth as told by Dr Lou natic;
Plankton like microbes were spawned by the sun( a natural event, WILL happen in earth-like conditions, not mysterious, sun+water=life)
Plankton competed with plankton, millions of different tiny crustaceans and molluscs evolved from plankton, as did the first plants that were actually algae(not a big leap, plankton are half animal half plant organisms, we can tell from this they are the ancestors of all life on earth, they range in appearance from blobs to crustacean like)
This early primitave life evolved into many different crustaceans, anemones and molluscs, predator and prey relationships formed, forming eco-systems and speeding up the evolutionary process for all the players involved.
Crustaceans were branching out, some were getting better at swimming and their armour plates were becoming more streamlined, turning into scales, becoming fish. Fish became lots of different fish, all the old things were still around(molluscs, crustaceans, anemones) in fact there were more species than ever, but less individuals in each species due to heavy competition from many different animals.
A famous fish went upstream, hanged around the banks of rivers, and found a crafty way to avoid predators, jumping out onto the dry land, and waiting for the water loving predator to move on before jumping back in the water. We've all seen mudskippers, this is their ancestor, it is also every land animals ancestor.
Some mudskippers got better and better at breathing air, being able to stay out of the water for longer and longer, eventually they managed to move around on land and needed the water less and less.
Different groups of mudskippers went there different ways. They formed amphibians and eventually reptiles. Reptiles were perfectly adapted to land. They blossomed and took over the land, forming new predator and prey relationships and thus eco-systems. Reptiles evolved and changed for a long time, some went back into the water(crocodiles, turtles etc), crossing over and interlocking the water and land ecosytems, but most remained on land feeding on plants which had also made their way to the land but that is another equally as illustrious story.
The "dinosaurs" we hear about were now in full swing, one little dinosaur developed started digging burrows, males and females of this dinosaur found that forming life bonds and sharing the responsibility offspring to be beneficial. They started giving birth to live young because they could afford to, they were the first. This dinosaur was the ancestor of mammals. It remained a sort of half reptile half mammal type creature for quite some time.
Meanwhile a different dinosaur started climbing trees and found that jumping off the tree was a good way to avoid tree climbing predators. It got better at jumping and eventually evolved basic wings for gliding to make the landing softer, and much later it learned to flap its wings and actually fly.
This was the birds ancestor but both the mammal ancestor and the bird ancestor remained reptiles until something catastrophic happened.
Something suddenly(relatively suddenly, probably over a period of more than a million years) started wiping out vast numbers of the larger dinosaurs. This is a mystery, the one thing we can't be sure of yet. There is evidence for comets, but there is also evidence for disease and el-nino. It was probably an unfortunate combination.
When the dust settled the survivors found huge niches unfilled, reminiscent of what the mudskipper found. Again evolution was kickstarted into a drastic change. Mammal ancestor and bird ancestor and small reptiles started freely branching out and forming new species. Bird ancestor became thousands of different birds, mammal ancestor became thousands of different mammals.
No, not the mammals we see today, humans were still millions and millions of years away.
But you can see how it works, humans are no stretch.
Mice become rats, rats become possums, possums become lemurs, lemurs become monkeys and apes, apes become homonids (humans and neanderthals), humans outcompete neanderthals, humans make up absurd concepts in their free time(ie god), humans take over the earth. Humans destroy eco-systems faster than any comet etc etc etc.
Any questions?