They are able to find more food than mice with dark-colored fur.

They choose to mate with other mice that have light-colored fur instead of dark-colored fur.

They stay cooler during hot summer days, so they are more likely to stay alive and have young than mice with dark-colored fur.

They are harder for hunting animals to see in the sand, so they are more likely to stay alive and have young than mice with dark-colored fur.

Thorns fall off of a rose bush when animals eat it.

Thorns stop animals from eating the rose bush.

Animals like to eat rose bushes that have thorns.

All rose bushes have the same number of thorns.

The color of the feathers of the birds

How high each bird can fly

The kind of trees where birds build nests

The number of eggs in each bird’s nest

Wild roses have thorns to protect them from being eaten by animals.

Wild roses absorb more water through their thorns.

Wild roses have colors to attract animals and insects.

Wild roses use their thorns to produce more food.

How much food the birds eat.

Where the birds travel.

Which birds are related.

What kinds of nests the birds build.

By helping the frog find other frogs.

By keeping the frog cool.

By making the frog hard to see when sitting on leaves.

By allowing the frog to make its own food.

The color of the feathers helps the birds locate nests.

The color of the feathers helps to control the amount of body heat the birds lose.

The color of the feathers blends into the birds' surroundings and helps the birds avoid predators.

The color of the feathers attracts the kinds of insects the birds like to eat.

The light moths will be captured by predators more easily than the dark moths, and the population of dark moths will rise.

The light moths will be captured by predators more easily than the dark moths, and the population of light moths will rise.

The dark moths will be captured by predators more easily than the light moths, and the dark moths will probably go extinct.

The light moths will change their wing color to match that of the dark moths.

camoflague

trait

mate

individual

The green insect population will increase and the yellow insect population will decrease.

The green insect population will decrease and the yellow insect population will increase.

Both insect populations will remain constant over time.

Both insect populations will increase over time.