| __ | 11. | biology | | A. | mollusk with two shells |
| __ | 12. | bivalve | | B. | hollow ball stage in the development of an embryo |
| __ | 13. | blastula | | C. | the study of life |
| __ | 14. | carcinogenic | | D. | cancer causing |
| __ | 15. | cerebrum | | E. | part of the vertebrate brain |
| __ | 16. | chlorophyll | | F. | cartilaginous fish |
| __ | 17. | Chondrichthyes | | G. | green pigment in plants necessary for photosynthesis |
| __ | 18. | chromosome | | H. | structure found in eukaryote cells that contains DNA |
| __ | 19. | circulatory | | I. | system for moving fluids through the body |
| __ | 20. | insecticide | | J. | a substance that kills insects |