The evolution of new organs usually builds on preexisting structures that are mo

Question

The evolution of new organs usually builds on preexisting structures that are modified in form and sometimes function. The embryos of fish, amphibians, reptiles, birds, and mammals all have pharyngeal pouches or gill slits. These pouches develop into gills in adult fish and they are used to absorb oxygen from their watery environment. These same pouches become parts of the ________ in humans.

a.

eyes and nose

b.

ear and throat

c.

eyes and lungs

d.

lungs and heart

a.

eyes and nose

b.

ear and throat

c.

eyes and lungs

d.

lungs and heart

Explanation / Answer

Option b is the correct answer. The pharyngeal pouches in human embryo do not develop into analogus organ (lungs) rather it develops into ear and throat. 1st pharyngeal pouch develops into auditory tube which is the part of ear, 2nd pharyngeal pouch develops into palatine tonsils which is the part of pharynx (throat). 3rd and 4th pharyngeal pouches develop into dorsal and ventral part of pharynx (throat).

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