Question about evolution?

theres a differnece between monkeys and apes. backbefore humans there were the apes. they lived in trees to avoid being eaten by the nasties on the ground like crocs and lions and stuff. somewhere along the line some of them decended to walk on the ground maybe for better food. this alowed the species to spread almost all over the world. some found it easier to walk upright, which aslo helped when having . they started to live in climates that were different than before and adapted over hundreds of thousands of years to lose hair and grow opposable thumbs and other small differences. those that didnt evolve simply didnt need to. they got food, water, protection and where they were so they stayed.