Question

1. In tetrapods other than mammals, the bones of the jaw joint are derived from pharyngeal arch number:

   		2
   		3
   		4-7
   		1

1 points   

QUESTION 24

1. In most fishes, the main site of gas exchange is the:

   		lungs
   		skin
   		pharynx

1 points   

QUESTION 25

1. A diaphragm that separates the thoracic and abdominopelvic cavities is a characteristic of:

   		the first amniotes
   		the first sarcopterygians
   		the first tetrapods
   		mammals

Answer 1

1.In tetrapods other than mammals, the bones of the jaw joint are derived from pharyngeal arch number: two

The jaw is derived from the most anterior two pharyngeal arches.

2. In most fishes, the main site of gas exchange is the: Pharynx.

Most fishes exchange gases like oxygen and carbon dioxide using gills that are located on both sides of the pharynx.

3. A diaphragm that separates the thoracic and abdominopelvic cavities is a characteristic of: Mammals.

Diaphragm is the muscle of respiration and seperates the thoracic and abdominopelvic cavities.