Evolution doesn't care if specific X species survives in its niche, but X species could be much more important than Y species. Extinction of keystone species(p

Evolution doesn't care if specific X species survives in its niche, but X species could be much more important than Y species. Extinction of keystone species(plankton X) will trigger dieoff down the food chain. Survivor species(plankton Y) which exploits extinction event environment don't have to contribute to the food chain: https://www.ecomagazine.com/news/science/indian-ocean-fish-die-off-linked-to-plankton-species https://www.ecomagazine.com/news/science/indian-ocean-fish-d...