"in every generation of every species a great many more individuals are born than can possibly survive; so that there is in consequence a perpetual battle for life going on among all the constituent individuals of any given generation."That's one example. Such quotes from evolutionists can be multiplied indefinitely.Romanes, Darwin and After Darwin
That isn't the theory of evolution. The theory of evolution is inherited changes, it says nothing about how successful those changes will be. Some will be successful and some won't be. But for arguments sake using your human example, how many of your billions of sperm that you produce survive? A couple? A dozen if they are lucky?
Where is the evidence that inherited changes don't exist?