SI2 - SI Thursday, March 26, 2009 4:00 PM 1. Environments o...

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SI Thursday, March 26, 2009 4:00 PM 1. Environments o Marine (oceans) Main advantage isotonic (equal concentrations) Increased density of water (salt water) Buoyancy Exert less energy when floating Lightens load and water does some of the work. Close concentration to cells in organism Water moves in and out of bodies at an equal rate External Fertilization Release gametes in environment (Spawning) Don’t have to worry about physical act of getting together Water environment is less volatile to the gametes Excrete Ammonia into environment Immediately distributed through environment and is diluted Don’t have to use energy to convert ammonia into another form 1. Protein has lots of Nitrogenous waste when breaking down amino acids. Nitrogenous Waste 2. Ammonia 3. Urea 4. Uric Acid o Freshwater Buoyancy still present but not as much Ammonia is waste. Don’t have to worry about converting to another form External Fertilization Release gametes into environment Disadvantages Water hypotonic to organism
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SI2 - SI Thursday, March 26, 2009 4:00 PM 1. Environments o...

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