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