~migration of birds into a new habitat ~pollen blowing in from plants in a far-away habitat ~fish swimming into a new habitat in a river ~seeds being carried to an island on the ocean waves The four e

~migration of birds into a new habitat

~pollen blowing in from plants in a far-away habitat

~fish swimming into a new habitat in a river

~seeds being carried to an island on the ocean waves

The four examples listed above could all be responsible for the change in a gene pool, also called