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1. 
individual level, survival, reproduction, fitness
2. 
animal group, urchin, seastar, water vascular system
3. 
habitat, saltwater, freshwater, critical salinity range
4. 
food chain, affecting all levels, famous example in kelp forests
5. 
corals, symbiosis, dinoflagellate
6. 
zooplankton movement, feed at surface at night, deeper depths during the day
7. 
primary production process, hydrothermal vents, gases
8. 
Antarctic animal, carbon sink
9. 
snails, feces, spreading, damaging Spartina
10. 
bioluminescence, defensive strategy, photophores
11. 
annelid, parapodia
12. 
sediment layer, black layer beneath, oxygen above
13. 
interaction, one benefits, second is not harmed nor helped
14. 
stubbornness to revert back to a previous ecosystem state