BIO120H1 Chapter Notes - Chapter 5: Trimethylamine N-Oxide, Transpiration, Tonicity
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BIO120H1 Full Course Notes
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Main distinction between living and abiotic systems organisms have a purposeful existence. 5. 1 water has many properties favorable to life. Water stays liquid over a broad range of temperatures because it resists changes in temperature. Water also resists changing states: this property helps water stay liquid in winter. Water becomes less dense as it becomes cooler. Water is dense (800 times denser than air), it provides support for organisms. Also viscous, and resists flow or movement of a body through it: aquatic animals have adapted to reduce drag in water. 5. 2 salt balance and water balance go hand in hand. When water evaporates from body surface, solutes are left, leaving a greater concentration in the body. Osmoregulation process of maintaining a proper salt balance. Terrestrial animals: less vulnerable to water loss than plants (internal gas exchange surfaces, eliminate salts through urine, desert animals have very efficient kidneys to conserve water.
