That's true. Every human in this world evolved from a common ancestor, and we evolved in a way called as "Parallel Evolution". Apes and humans evolved from a common ancestor, and, because our environments were similar, we evolved much the same way.
But, apes took trees and we took land, and our intellience level also increased so our genes and body structure changed, and we evolved and look what we are today.
Also, many species evolve from a common ancestor, but because of their long geographic isolation from each other, look less and less alike, that they can't even interbreed with each other. For example, Darwin's Finches - When they reached Galapagos Islands, they setlled there. Then, they would eat seeds and fruits and multiply, untill there was competetion for existence. Because of this, some bird population were able to fly to other islands, after a while, they evolved.
^[One of his theories]