name chordata comes from the notochord

notochord is a flexible rod that supports a chordate's back

the connection between the brain and the nerves

called pharyngeal

can be used as gills

most disappear before birth

why it can classify as a vertabrate

its is flexible

endoskeleton

protects internal organs

does not produce much internal heat

body temp changes based on its environment

body temp stays the same no matter the enviornment