Biology Ch. 6.3 Cnt Word Scramble
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Term | Definition |
Phylum Chordata (Chordates) | Most members of this phylum are vertebrates with bony skeletons and backbones. Most common on land & in water. Many fewer chordate species than invertebrate species. |
A Dorsal Nerve Cord | Nerves branch to all parts of the body. |
A Notocord | Rod of cartilage that runs along the dorsal length of the body. |
Gill Slits | In the pharynx (throat). |
Amnion | Fluid-filled sac around the embryo. |
Chordate Respiration | Fish are the only vertebrates adapted to live their lives entirely in water. They obtain oxygen from the water through their gills. Reptiles, birds & mammals have lung-base respiratory systems. |
External Fertilization | The egg & sperm meet outside the body. Ex. Sharks, frogs |
Internal Fertilization | The egg & sperm meet inside the body Ex. Reptiles, birds, mammals Mammals are the only vertebrates in which the embryo develops internally! |
Chondrichthyes (Cartilaginous Fish) | Skeleton is made of cartilage instead of bone Have 5-7 gill slits but lack gill covers Ex. Rays, skates, sharks |
Osteichthyes (Bony Fish) | Most numerous of the vertebrates. Skeletons are made of bone. Ex. Herring, trout, cod |
Amphibia (Amphibians) | In early stages are gill breathers in water, but live as air breathing adults on land. Have a heart with 3 chambers. Ex. Frogs, toads |
Reptilia (Reptiles) | Have better developed lungs than amphibians. Have a rib cage Skin is thick and scaly & is made from keratin (a protein) They shed their skin several times each year. Ex. Lizards & snakes |
Aves (Birds) | Have feathers Bones are hallow…..why?? Ex. Robins, Blue Jays, Swallows |
Mammalia (Mammals) | Have hair Have milk-producing mammary glands Give birth to live young Most live on land A small number are adapted to life in the water (i.e. whales, dolphins) |
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