Chordate pharyngeal slits appear to have functioned first as ________.
A) the digestive system's opening
B) suspension-feeding devices
C) components of the jaw
D) sites of respiration

Question

Quizplus · Accepted Answer

Chordate pharyngeal slits first functioned as suspension-feeding devices, allowing early chordates to filter food particles from the water. Over time, these slits were adapted for other purposes, such as respiration in aquatic species and components of the jaw in some vertebrates.

Chordate Pharyngeal Slits Appear to Have Functioned First as ________