Question

In humans which embryonic structure develops into ear canals and the eustachian tubes?

A. pharyngeal slits
B. notochord
C. myotomes
D. post axal tail

Answer 1

A. pharyngeal slits

Step-by-step explanation:

Answer 2

I think A

I hope this is help

Step-by-step explanation:

The Eustachian tube originates from the tubotympanic recess, an embryonic structure derived from the first pharyngeal and second endodermal pouches. The proximal portion of the tubotympanic recess forms the tympanic cavity, and its distal portion becomes the Eustachian tube.