17.1 common traits of vertebrates

Vertebrae

Bones located in the middle of your backJoined together with cartilage to form the backboneProtects the spinal chord

Notochord: flexible skeletal rod – is replaced by backbone

Vertebrae

ENDOthermsAnimals with CONSTANT internal body temperaturesBody cells produce heat to keep bodies warm

**Humans are ENDOTHERMS

Examples of Endotherms

ECTOtherms

Animals with bodies that receive heat from the OUTSIDEBody temperature depends on environment

Ectotherm Examples

Origin of Vertebrates

500 million years ago

Water-Dwelling Fish Like Animals

Different Kinds of

Adaptation: Strong, lobe-

like fins

Adaptation: Lungs

7 Classes of Vertebrates1)Class Agnatha {Jawless Fish}

2)Class Chondrichthyes {Cartilaginous Fish}

3)Class Osteichthyes {Bony Fish}

4)Class Amphibia {Amphibians}

5)Class Reptilia {Reptiles}

6)Class Aves {Birds}

7)Class Mammalia {Mammals}

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