photosynthesis

is the process plants use to make food. The food they make

is called

glucose

To make

plants need

They also need a chemical called

gives plants their

color. As autumn approaches

and days get shorter, plants get less

stops and

starts to disappear from the leaves. Now other colors also can be seen. The

red and purple colors are caused by

that was trapped in the leaves when

stopped. The

colors are caused by waste trapped in

the leaves. The

and

colors were always there; they

were just hidden by the

color of the