Protozoan Packet Crossword

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

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