A virus, bacteria, or fungi that makes a plant sick.
The slender stem of a leaf that connects it to the main branch or stem of the plant.
A chemical smell an insect releases to attract other insects.
The cells of a tree that carry nutrients or "food" for the tree.
Thick, sticky substance produced inside a tree trunk. It is similar to sap, but is thicker and is only produced by pine trees.
The third stage in an insect's life cycle. During this stage, the insect is wrapped in a protective coating (such as a cocoon) while it rests and slowly changes into an adult.