Question

How can the inability to adapt may cause a species to become extinct

Answer 1

This is called Natural selection, if a species can not adapt to its in environment it will b come extinct because for example if you were to have a white mouse in a brown forest it would get eaten instead of having a brown mouse that has adapted, it would be able to survive

Answer 2

Not being able to adapt creates competition from those who can adapt, new predators and loss of habitats. Those are all environmental pressures that can limit the growth of a population and lead them to extinction if they are unable to adapt.