The Earth has experienced 5 waves of mass extinciton (6th one is incoming) and life has still survived. I think the most definitive end of animal life on earth will be when our sun expires and becomes a red giant – the earth will be engulfed by it, making life as we know it impossible to survive.
We will all be extinct in the end, but not for billions of years and you never know we have have found and moved to another planet by then or found a way to stop it happening, look on the bight side of life and take care of our planet to help it live longer!
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