There are many natural ecosystems being wiped out by invasive species that do not have human presence. https://education.nationalgeographic.org/resource/invasi

There are many natural ecosystems being wiped out by invasive species that do not have human presence. https://education.nationalgeographic.org/resource/invasive-species/ https://education.nationalgeographic.org/resource/invasive-s... But humans are almost always the reason for the introduction of invasive species either by accident or purpose.