Answer to Question 1ANS: C
Desiccation is the drying out of an organism. Motile animals can move towards water, but sessile
organisms must await the return of water. They trap water within their shells to keep their gills moist.
Some have a protective mucous which prevents water loss. Information can be found in the section
Examples of Marine Communities.
Answer to Question 2ANS: C
The Arctic does not have a deep scattering layer. Perhaps this is due to the abundance of nutrients in
the deep water and the waters above. Information can be found in the section Examples of Marine
Communities.
Organisms exhibit a diversity of behaviours, which include (clockwise from upper left), foraging and
Some organisms used as models in genetic research
Vasectomy. (a) Vas deferens is located within the spermatic cord on both sides. (b) A small incision
Compression Wave in Traffic Flow
Slow-Wave Sleep and Learning
Modification steps (1–4) that occur in maturation of E. coli tRNATyr from its transcript