If we are evolved from apes, why don't all ape evolve and become human.
Why the today's ape stop evolving to become a human?
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I am not going to bother putting any references for this answer as all the information is a google search away.
Humans did not evolve from apes. Extant humans and apes developed from a common ancestor. One lineage from this common ancestor evolved and became apes. Another lineage went on to become humans.
Unless one can describe a "common ancestor", this phylogenetic knee jerk response begs the question. Humans evolved from animals not distinguishable taxonomically from apes. Phylogeneticists invoke the common ancestor explanation because their analysis is actually a form of cluster analysis, where groups of traits split dichotomously into smaller groups of traits. This is not a model of evolution.