Give three basic chordate characters

Phylum Chordata : It includes highest evolved animals of the animals kingdom. Chief characteristics of the phylum are :
(a)Notochord : A dorsal solid notochord is present throughout life or in larval stages.
(b)Nerve cord : A dorsal hollow nerve cord is present.
┬ęPharyngeal gill slits : A perforated pharynx is present in young condition or throughout life.