Answer to Question 1
The reticulum contains small compartments that trap and provide a storage place for hardware that does not float. This prevents the dangerous objects from proceeding through the rest of the digestive tract. The reticulum also functions to store, sort, and move feed back into the esophagus for regurgitation or into the rumen for further digestion. The process of breaking down roughages begins with the contraction of the reticulum and muscles in the esophagus to move roughages and fluid to the mouth. Excess fluid is squeezed out, and the material is reswallowed. The rumen functions as a storage vat where food is soaked, mixed, and fermented by the action of bacteria. Bacteria also use nitrogen to form amino acids and eventually proteins. The omasum grinds roughage using blunt muscular papillae that extend from many folds of the omasum walls. The abomasum functions in a similar manner to the glandular stomach of monogastric animals.
Answer to Question 2
D
The functions of species richness.
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