A student observes a group of sunflowers in a field. All the sunflowers have yellow petals and face the sun. Which observation describes a trait variation?

One sunflower is taller than the others.

The sunflowers are all plants with roots.

The sunflowers need sunlight to make food.

All the sunflowers have green stems and leaves.

All ladybugs share traits like having six legs and a small, round body. What is the main function of these shared traits for classification?

To determine the insect's exact age.

One squirrel has a bushier tail than another.

All maple trees have leaves that change color in the fall.

A house cat has stripes, while its brother is solid black.

Two roses from the same bush have a different number of petals.

A robin that builds a nest out of twigs.

A robin that has a slightly lighter shade of red on its breast than other robins.