1. 28-3 Insects

2. Incomplete metamorphosis Type of insect development characterized by a similar appearance throughout all stages of the life cycle.

3. Nymph Immature form that lacks functional sex organs and other adult structures.

4. Complete metamorphosis Type of insect development in which the larvae look and act nothing like their parents and also feed completely different ways.

5. Pupa Stage of metamorphosis in which an insect changes from a larva into an adult.

6. Pheromone Specific chemical messenger that affects the behavior or development of other individuals of the same species

7. society Group of closely related animals of the same species that work together for the benefit of the group

8. caste Group of individual insects specialized to perform particular tasks, or roles.

9. Key concept Insects have a body divided into three parts- head, thorax, and abdomen. Three pairs of legs are attached to the thorax.

10. Key Concept The growth and development of insects usually involve metamorphosis, which is a process of changing shape and form. Insects undergo either incomplete metamorphosis or complete metamorphosis.

11. Key Concept Ants, bees, termites, and some of their relatives form complex associations called societies.