Marine Biology Live Class

3. Determining the location of objects by reflected sound.
5. This zone is the depth of the water nearest to the surface where enough light penetrates to allow photosynthesis.
6. The relation between two interdependent species of organisms.
8. Any animal lacking a backbone or notochord.
10. The degree or intensity of heat present in a substance or object, especially as expressed according to a comparative scale and shown by a thermometer or perceived by touch.
11. Single celled microscopic organisms that are found scattered throughout the photic zone.
12. The ability to glow in the dark; production of visible light by living organisms.
14. The total amount of dissolved salts in seawater, measured in parts per thousand.

1. Zone known as the depths beyond which less than 1% of sunlight penetrates.
2. Marine mollusk characterized by well‐developed head and eyes and sucker‐bearing tentacles.
4. Process similar to photosynthesis but uses chemical energy instead of light energy to make food from the carbon in carbon dioxide.
5. Synthesis of compounds in plants aided by radiant energy.
7. Mainly aquatic arthropod usually having a segmented body.
9. Zone known as the twilight layer, this zone has only a small amount of light.
11. The continuous physical force exerted on or against an object by something in contact with it.
13. Invertebrate with a soft unsegmented body usually in a shell.