👉 Pre-extinction is a term used in paleontology to describe an early stage of life, typically occurring before the appearance of any significant evolutionary change. During this time, organisms are still relatively young and have not undergone any significant changes that would indicate their extinction. The term is often used to refer to the period between the Cambrian explosion (about 543 million years ago) and the end of the Mesozoic era (around 68 million years ago). Pre-extinction organisms may
