Chapter 1: Characteristics and Classification of Living Organisms
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Question
List the 5 vertebrate classes and their main distinguishing external features.
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Answer
1. Fish: Scales on skin, fins for movement, gills for breathing, lay soft eggs in water.
2. Amphibians: Moist permeable skin, lay jelly-covered eggs in water, larvae have gills / adults have simple lungs.
3. Reptiles: Dry skin covered with scaly keratin, lay soft leathery-shelled eggs on land, have lungs.
4. Birds: Feathers, wings, scaly legs, beaks, lay hard calcium-shelled eggs, endothermic (warm-blooded).
5. Mammals: Fur or hair on skin, give birth to live young, feed young with milk from mammary glands, external ears (pinnae), endothermic.