The mesopelagic zone extends from about 200 m to about: (10 points) b. d. 300 m 500 m 1,000 m 2,000 m 4,000 m The water below the oxygen minimum layer has: no oxygen at all only very small traces of oxygen some of the oxygen it had when it left the surface most of the oxygen it had when it left the surface The zone immediately below the bathyal zone is called the: abyssal hadal subtidal subbathyal mesopelagic Deep-sea pelagic fishes are characterized by all of the following except: small eyes absent or reduced swim bladder color spotted with red flabby muscles large mouth and teethPheromones are special chemicals that are used to: digest food attract mates catch prey transport oxygen produce bioluminescence The deep-sea benthos consists mostly of: deposit feeders filter feeders herbivores omnivores carnivores The deep-sea scavengers include animals that feed on: deep-sea plankton bottom meiofauna particulate organic matter dead animals bacteria Bacteria thriving around deep-sea hydrothermal vents are: photosynthethic symbiotic heterotrophic parasitic chemiosynthetic The major advantage that deep-sea benthic animals have over pelagic ones is that heir food: (10 points) time c. s easier to digest falls to the bottom and stays in one place, thus being available for a longer gets to be eaten before it gets to pelagic animals gets less decayed by bacteria produces less detritus A shrimp that occurs in large numbers around deep-sea hydrothermal vents does not have eyes.

Light-sensitive cells on the top of the body, however, appear to be used to detect faint light from: (10 points) bioluminescent predators the surface faint glow around vents bioluminescent prey mates