Species or whole families of organisms die out  (extinction)

Any of 3 factors can contribute to extinction:

1. environment changes too quickly

2. new predator or disease kills them

3. beaten by another species for competition for food

Slowly changing environments mean that gradually certain characteristics will become favourable and those species without these characteristics will die out

The environment can also change quickly. This affects great numbers of species that cannot keep up with the changes required for survival