The Pharyngeal Gill Slits of Chordate Ancestors Functioned as Sites

question 3

Multiple Choice

The pharyngeal gill slits of chordate ancestors functioned as sites for

• A) uptake of oxygen only.
• B) both uptake of oxygen and release of carbon dioxide.
• C) release of carbon dioxide only.
• D) removal of small prey from the water.
• E) forcible expulsion of water to move the animal.

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