Across
- 5. so small as to be visible only with a microscope
- 6. a rigid external covering for the body in some invertebrate animals
Down
- 1. an animal's natural coloring or form that enables it to blend in with its surroundings
- 2. showing luminous colors that seem to change when seen from different angles
- 3. an invertebrate animal such as an insect, spider, or crustacean
- 4. the natural coloring matter of animal or plant tissue