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What is osmosis?
Osmosis is the net movement of water from
an area of high concentration (of water) to
an area of low concentration (of water)
along a concentration gradient.
Definitions
· Hypertonic: a solution containing a greater amount of dissolved stuff than a
creature or object in the solution.
· Hypotonic: a solution containing a lesser amount of dissolved stuff than a
creature or object in the solution.
· Isotonic: a solution containing an equal amount of dissolved stuff than a
creature or object in the solution.
· Osmoregulation: the process of regulating the amount of salt and other
dissolved substances to control the loss or gain of water from osmosis.…read more

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http://marinediscovery.arizona.
edu/lessonsS01/blennies/2.html
Salmon -Salmon have well designed excretory systems that can adjust to their dual fresh-
water and salt-water habitats.
Freshwater Snails -Fresh water snails have an outer shell that protects a large part of
their surface from the osmotic inflow of water. The kidneys and excretory system
provide additional osmoregulation.
Marine invertebrates: Marine invertebrates have body fluids that are isotonic to the
surrounding environment. Marine invertebrates like lobsters, crabs, and shrimp taste
"salty" because their bodies must contain lots of salt to keep their body fluids isotonic
to their salt-water homes!…read more

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