system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are there no living Homo Erectus?

There are still very early stages of our evolution left on the planet.  Why are there such major gaps in what remains?
gpt
They actually have descendants living today.  We are their descendants.  They evolved into a few other species of which Homo sapiens is one.  Species is a human concept.  If you traced your line back to Homo erectus you'd never see an offspring come from a parent who belonged to a different species.