Animals Chapter 3 Section 4 Reptiles. Protection from Drying Out ► A reptile is an ectothermic vertebrate that has lungs & scaly skin ► Can spend entire.

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Presentation transcript:

Animals Chapter 3 Section 4 Reptiles

Protection from Drying Out ► A reptile is an ectothermic vertebrate that has lungs & scaly skin ► Can spend entire life on land ► The eggs, skin, & kidneys are adapted to conserve water ► The eggs of reptiles are fertilized internally ► The reptile’s egg has a shell & membranes that protect the dev embryo & keep from drying out

Protection Continued ► Membrane’s in egg serve several purposes ► Liquid serves as a bubble wrap to protect ► Keeps embryo moist ► Holds yolk which provides food for its cells to grow ► Scaly skin protects reptiles & helps keep water in the bodies. ► Kidneys filter wastes in the blood ► Urine concentrated so there is little water loss

Obtaining O from the Air ► Most reptiles breath with their lungs ► 2 loops in which blood circulates thru their bodies ► Most reptiles are either lizards or snakes ► Both are disgusting ► Most snakes only have one lung  The reason is that snakes used to smoke and have lost a lung thru evolution

More Facts ► Snakes are carnivores ► Turtles have strong protective coverings or shells ► Some are carnivores and others herbivores ► Alligators & crocodiles are the largest reptiles  Crocs have pointed snouts; alligators rounded

Extinct Reptiles the Dinosaurs ► What caused their demise?  Meteorite? ► Huge clouds of dust  Weather change?  Did they, like snakes, take up smoking?