Which statement summarizes the theory of common ancestry? Select one:

All living things on Earth are related.

All living things on Earth are the same species.

Groups of living things on Earth share common ancestors but are not related to each other.

All living things on Earth depend on the sun for their energy.

Which of the following would be an important part of a multi-step plan to restore the stability of the red-cockaded woodpecker's ecosystem?

Why do leaves change color in the fall? green pigments break down and no longer mask the color of chlorophyll. chlorophyll breaks down and no longer masks the colors of other pigments. red- and yellow-colored pigments grow and mask green-colored chlorophyll. green-colored chlorophyll breaks down and turns red and yellow.

Match the reproductive structures based on their function and the system to which they belong. egg ovary sperm vas deferens vagina fallopian tube testis urethra