our kids (part 3)

"papa,how long have humans been living in cities n urban environments? is it we only started moving outta treetops 1000 years ago?"

"no la,ah boy..we've been living in artificial habitats for much much longer than that.. you know yellow river valley,indus valley,etc? people started living in settlements in those areas since more than 3000 years ago!"

"...hmm...but that time u said humans will evolve and those parts of our bodies that we no longer need will grow smaller (e.g. tailbone) n eventually disappear?then how come our arms still so long?we still need to climb trees meh?"