Видео с ютуба Differences Between Higher Chordates And Lowerchordates

Differences b/w Protochordata(Acraniata /Lower chordates)& Euchordates(Craniata or higher chordates)

THE LOWER CHORDATES

Chordates - CrashCourse Biology #24

Difference between chordates and non chordates

Urochodata lower chordates

Animals: Tour of 9 Phyla