Answer: The extinction of one organism can cause a ripple effect that impacts all of the species involved in that food web. The extinction of a keystone species might force all of the connected organisms to adapt, and another species to rise up and take it's empty place in the food web, or the whole food chain might also die out, because this species is one whose presence and activities strongly affected the other species. The extinction of species with a strong interaction in the food web occur more often than the extinction of the ones that do not have much interaction.