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What are the closest relatives to vertebrates?
Hagfishes
What first type of animals have vertebraes?
Lampreys
What vertebrates developed jaws, teeth, and paired fins
Chondrichthyans- Sharks, skates, rays, and chimeraes.
What vertebrates developed bony skeletons, swim bladder/lung
Ray-finned fishes
What are swim bladders
Gas-filled sacs that supplemented gas exchange and promoted buyoancy.
What are the three groups of lobe-limbed vertebrates?
Coelacanths, lungfishes, and tetrapods
What did lungfishes develop?
Internal nares, which allows them to have both lungs and gills.
What did tetrapods develop?
4 limbs, which eventually allowed them to become specialized for movement of land.
What are the 2 groups of tetrapods?
Amphibians and Amniotes
What did amphibians develop?
Terrestrial limbs/digits
What did amniotes have?
Amniotic egg
Signficance of amniotic egg
Key innovation for organisms to exploit terrestrial habitats.
What are the two types of amniotes?
Reptiles and mammals
Key features of mammals
Mammary gland, 4 chambered heart, hair, and sweat glands.