Plankton

1. substance that provides nourishment essential for the maintenance of life and for growth
4. where the phytoplankton are the most concentrated
6. percentage of the Earth oxygen that is produced by the phytoplankton's photosynthesis
9. the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar
14. a green pigment, present in all green plants and in cyanobacteria, which is responsible for the absorption of light to provide energy for photosynthesis
18. consisting of small animals and the immature stages of larger animals
19. the process by which the nutrients are rising to the surface
21. animals that eat other animals
22. tiny, single-celled living organisms
23. marine animal, member of the megafauna

2. interaction between two different organisms living in close physical association, typically to the advantage of both
3. a biological community of interacting organisms and their physical environment
5. a plant that can make its own food
7. consisting of microscopic plants
8. an instance or amount of seawater is rising up
10. models representing components of an ecological system
11. world's largest and deepest ocean, lying between Asia and Australia and North and South America
12. results of the phytoplankton's photosynthesis
13. all life on earth
15. an individual animal, plant, or single-celled life form
16. a pathway of feeding relationships
17. matter that is contained in the ocean floor, it is what the phytoplankton takes when it drifts down
20. the large mammals of a particular region, habitat, or geological period