Could humans evolve into a different species?

Yes — in principle, humans could evolve into a different species. That would happen through speciation, which requires long-term reproductive isolation and enough genetic divergence between populations.

In practice, this is very unlikely on Earth anytime soon because humans still interbreed widely across the planet. If a new human species ever did emerge, it would probably require something like:

1. Long-term geographic isolation
   For example, a population separated on another planet, a very remote colony, or an isolated society could diverge over many generations.

2. Strong artificial or intentional genetic change
   Extensive genetic modification could, over time, produce a lineage so different that it no longer fits the same reproductive population as unmodified humans.

3. Very long periods of isolation plus natural evolution
   Even without dramatic intervention, isolated populations can gradually accumulate differences through mutation, natural selection, and genetic drift.

Human evolution is still happening today. Well-known examples include lactase persistence, high-altitude adaptations in Tibetan populations, and some disease-related adaptations such as malaria resistance.

So the short answer is: yes, it’s biologically possible, but it would likely take a very long time and would require sustained isolation or strong directional change.