BSsqans-lect22 amphirepts

BSsqans-lect22 amphirepts - BIS 1B(Winter 2008 Study...

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BIS 1B (Winter 2008) Study question answers: Amphibians and Reptiles Lecture 22 1. One of the biggest problems in evolving a terrestrial existence is the conservation of water. Compare the ways in which amphibians and reptiles have solved this problem? Amphibians must stop cutaneous water loss, and enhance cutaneous water gain. So a path of dehydration is through the skin. They have numerous behavioral adaptations to maintain water, are often nocturnal, and hide in moist microhabitats during the daytime. They possess morphological modifications of the skin, including keratin and wax deposits that help cut down on water loss. They also may use the urinary bladder as a water storage organ. Reptiles on the other hand have a thick waterproof skin and a waterproof egg shell and excrete uric acid, which greatly reduces water loss. 2. What are the advantages and disadvantages of an amniotic egg versus giving birth to life young? What do the terms oviparous, ovoviviparous, and viviparous mean?
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