• Marine organisms range in size from tiny bacteria to the largest known animal, the blue whale.
  • All are adapted for life in salt water.
  • Most plankton are too small to see with the unaided eye.
  • Most nekton are fish, although some are mammals.
  • Benthos bury in the sediment, attach to rocks, or crawl over the seafloor.
  • Some benthos live near vents on the deep ocean floor, where hot water pours out of the vents.
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