Phylum Chordata-Which animals belong?

Which animals belong in phylum Chordata?
Most people describe chordates as having a backbone.
Technically, all chordates have a notochord A notochord is a primitive beginning to the backbone.
In some chordates like the lamprey, the notochord remains there for life. In vertebrates, such as humans, and mammals a more complex backbone appears and only portions of the notochord remain.
Chordates also have a nerve chord.
There are many types of chordates but most can be classified as chordates who have jaws.
Most people are familiar with these chordates

Fish
Most also breathe with gills and have scales that cover their bodies
Fish are cold-blooded.
The cartilaginous fishes. Examples: sharks, rays.
The skeleton of the cartilaginous fish is out of a flexible bone- cartilage.
The bony fishes. Examples: perch, goldfish, trout.

Reptiles
Scaley skin
Reptiles produce shelled eggs or bear live young.
All species fertilize eggs internally.
All species of reptiles have at least one lung.

Amphibians
Have smooth slimy skin
Some species fertilize eggs externally, some internally.
Many can breathe through skins and have lungs

Mammals
Are endothermic.
Have hair on their bodies.
Produce milk to feed their babies.
Most produce offspring internally

Aves ( Birds)
Birds have Feathers.
All birds have wings, but not all birds fly.
Most birds have beaks or bills.
All birds lay eggs

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