1. Give a definition of an invasive species and name an example of one you know not mentioned in the article.

Describe five factors that influence the value of fuel

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.

Which is not displayed on the graph