How do we classify vertebrates?SCIENCE CH. 1 L. 2 NOTESPG. 10 - 17

Vocabulary

Vertebrate – animal with a backbone

Animals

Multicellular – made of more than one cell

Cannot make their own food Animals must eat other organisms for

energy Can move on their own Two phyla of animals:

Vertebrates – have a backbone Invertebrates – don’t have backbone

Phylum Chordata(Vertebrates)

Fish

Birds

Amphibians

Reptiles

Mammals

Mammals

Have hair/fur on their bodies Warm-blooded – body temp. is nearly the

same all the time Live birth

Mothers nurse (feed) young with milk Young are born looking like the parents

Reptiles

Have tough, dry skin with scales Cold-blooded – body temp. will change

with the surrounding environment Hatch from hard-shelled eggs

Survive on their own from birth Young are born (hatched) looking very

similar to parents

Birds

Have feathers and beaks Warm-blooded Hatch from hard-shelled eggs

Parents take care of young Young are born looking somewhat like parents

Amphibians

Soft, moist skin Can absorb water and oxygen

Cold-blooded Hatched from soft-shelled eggs

Survive on their own from birth Born looking nothing like parents

Metamorphosis – more complicated life cycle

Fish Most have scales

Also a slimy coating to help water flow past them Cold-blooded Hatch from soft-shelled eggs

Survive on their own from birth Look somewhat like parents when born Only class of vertebrates that only lives in water Can move by bending body or just moving fins

Dinosaur Fossils In early 1800s, scientists began classifying fossils of

bones Compared fossil bones to animal bones today.

Many were like today’s lizards Because of the huge bones, they were called “dinosaurs”

Dinosaur = “terrible lizard” Most dinosaurs were about 3 ft. long

Comparing Dinosaurs

Dinosaur Legs go

down from bodies

Today’s Lizards

Legs go out from bodies

• Scales• Backbones• Many had

4 legs