Across
- 2. - A poisonous substance produced within living cells or organisms.
- 4. - Relating to water; living or growing in, on, or near the water.
- 5. - A substance used to stimulate the production of antibodies and provide immunity.
- 9. - Variants of a particular chemical element which differ in neutron number.
- 10. - Relating to or forming a large mass; having great size and weight.
- 13. - A substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.
- 15. - The geological process by which material is added to a landform or landmass.
Down
- 1. - A complete and closed path around which a circulating electric current can flow.
- 3. - The study of heredity and the variation of inherited characteristics.
- 6. - The maximum extent of a vibration or oscillation, measured from the position of equilibrium.
- 7. - A subatomic particle of about the same mass as a proton but without an electric charge.
- 8. - The minimum amount of any physical entity involved in an interaction.
- 11. - A measure of the disorder or randomness in a system.
- 12. - A chemical element, a colorless, dense, odorless noble gas found in the Earth's atmosphere.
- 14. - Simple non-flowering plants that include seaweed and many single-celled forms.