Modification of the Pharyngeal Slits for First Use in Respiration

question 10

Multiple Choice

Modification of the pharyngeal slits for first use in respiration occurred in early

• A)fish with the development of gills.
• B)amphibians with the development of external gills.
• C)reptiles with the development of the modern lung.
• D)lophophorates well before we reach the chordates.
• E)echinoderms as a new respiratory apparatus.