Science Terminology

1. One celled organisms without a nucleus
4. The division in the classification system below kingdom and above class
5. The last level of classification of living things
6. Jawless fish with an internal skeleton made of cartilage
7. Bacteria and fungi responsible for the natural breakdown of waste
8. Describes animals with a body temperature that varies with the temperature of their surroundings
12. A key with two choices at each stage
13. Describes animals with a body temperature controlled internally
15. Organism that feeds off its host and lives on its host

1. A subclass of mammals that lay eggs
2. Cannot be seen without the help of a microscope
3. Animals with a nerve cord running down their backs and an endoskeleton
9. Fish with proper jaws and teeth, a skeleton made of cartilage and fins on the sides of their bodies as well as along their backs
10. The bony fish; example tuna
11. Plants that bear their seeds on cones and have male and female cones on separate plants
14. The building blocks of all living things