They decided to turn black.

The environment (trees) changed because of pollution.

The black moths were smarter.

Polar bears are stronger, so they can swim farther.

Polar bears are faster, so they can outrun hunters.

Polar bears' fur blends in with the snow allowing it hide.

They evolved naturally in the wild, through years of natural selection.

Humans bred them each specifically through artificial selection over the last 15,000 years.

They knew being cute would help them survive, so they switched things up genetically.

over a mate

over territory

over who has the longest tail

over prey

Only the fastest, strongest and smartest iguanas will survive.

There black skin is easy to see in the sand.

There long strong tails are great for swimming.

The fastest iguanas are selected by scientists to breed.

different beaks for different places to live

different beaks for eating different prey

different beaks for different fashions

different beaks for different mating rituals

When humans control breeding, by selecting mating partners, like we see with dogs.

Changes in animal traits over time that are not related to its environment.

Organisms better adapted to their environment tend to survive and produce more.

is the process by which ancient organisms have descended from modern organisms.

the change in the characteristics of a species over several generations and relies on the process of natural selection.

is the process by which animals make decisions to adapt to their environments.

A mutation happened when her DNA was copied.

She had always wanted a white baby bear.

The snow was white, so her body knew to make the change.