Across
- 2. a "container" within which a tintinnid is housed. It is either secreted by the organism or composed of foreign material cemented together
- 3. very small particles of the decaying remains of dead plants and animals; an important source of food for many marine animals
- 5. a type of radiolarian skeleton which is delicate and lace-like
- 7. the relationship in which two organisms live together in close association
- 12. the process of using food material produced by other organisms
- 15. the area from the water surface to the bottom
- 16. a "false foot", formed by an extension of cytoplasm. It serves as a means of locomotion and a way of surrounding and thereby absorbing food
- 17. the outer portion of the radiolarian's cytoplasm that is nucleated
- 18. a slimy lubricating and cleansing secretion
- 19. a vertical, cylindrical sample of the bottom sediments
- 20. an ocean bottom sediment consisting of 30% or more foram skeletons
- 22. the process by which a species becomes better suited to survive in an environment
- 23. small cavities that may contain secretions of the protoplasm or substances about to be excreted
- 24. a foram that secretes a single chamber
Down
- 1. a type of radiolarian skeleton composed of silicon and possessing long needles which pass through the organism to the outside surface
- 4. symbotic one-celled algae found in coral, sea anemones, mollusks, and other types of marine organisms
- 6. tiny, hairlike projections; used for locomotion in some one-celled organisms
- 8. inhabiting the open water of the ocean, rather thatn the bottom of the shore
- 9. bottom dwelling organisms
- 10. a foram that secretes several chambers
- 11. small plants and animals floating in the upper layers of the water column
- 13. an organic matrix whith embedded grains of sand
- 14. structures used by radiolarians to aid in controlling their depth in the water column
- 17. the inner portion of the raiolarian's cytoplasm that is nucleated
- 21. a hard, outer covering