Bioscience chp 27 animal diversity_post改.pdf

Scales waterproof ectothermic do not maintain body

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scales = waterproof ectothermic: do not maintain body temperature; use external heat Fishes: tied to water for all phases of life Class Aves : birds; derived from dinosaurs. Feathers & flight endothermic: maintain consistent body temperature iclicker When describing the evolution of tetrapods, which of the following is correct? a) Chondrichtythes are the closest relative to tetrapods b) Efficient gills were the most important development to terrestrial colonization c) Ray-finned fishes (Actinopterygii) likely developed into terrestrial mammals d) Lung fishes (Dipnoi) are the likely closest link between fishes and terrestrial tetrapods Amniotes Amniotic egg: adaptation to reproduce without an aquatic environment Specialized membranes to nourish and protect embryo Shell prevents desiccation Mammals have no shell, but prevent desiccation internally Mammals 3 major mammalian lineages Examples: kangaroos, koala - offspring matures in pouch Monotremes Marsupials Echidna & Platypus - lay eggs -milk is lapped off skin Eutherians Most mammals today Placental mammals
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What are 5 patterns you can notice in this diagram? 1. All animal share a common ancestor 2. Sponges are basal animals 3. Eumetazoa is a clade of animals with true tissues 4. Most animals belong to the clade Bilateria 5. Most animals are invertebrates
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