Originally posted by EcstremeVenom
im not sure how this proves evolution, there are many species that are similar with each other but they are in the same family; does that mean they all evolved from the same species, or does that mean they are just similar? because if it doesnt mean they came from the same thing, then how does the similarities between human and apes prove evolution? i think it just means we're in the same family
There's two issues here EV.
Certainly there are some obvious similarities that suggest common ancestry. If we look at all vertebrate animals for example - they show the signs of having evolved from a common ancestor with 4 limbs. We all have this feature - although some now use two or four of those limbs in other ways than walking.
There is also the issue of convergence in evolution. In simple terms this is when useful and similar features evolve more than once. A nice example is wings. Birds evolved wings. So too did some mammals - bats, flying foxes, for example. These features don't mean bats and birds share a common ancestor - they do, but so do we, and we don't have wings. It means that wings - a useful feature for these species in ceratin environments - have evolved more than once.
There are many examples of convergence in evolution - you could see it as nature sort of choosing the best solution for a particular problem more than once.