Saturday, December 1, 2007

Concept 28.6

Question:
I. Why do forams have such a well-preserved fossil record?

Answer:
a) Because foram tests are hardened with calcium carbonate, they form long-lasting fossils in marine sediments and sedimentary rocks.


Question:
II. Compare feeding forams and radiolarians.

Answer:
a) Forams feed by extending their pseudopodia through pores in therir tests. Radiolarians ingest smaller microorganisms by phagocytosis using their pseudopodia; cytoplasmic streaming carries the engulfed prey to the main part of the cell.

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