Question

1. A vertebral column with a lumbar region without ribs first appeared in the:

   		first amniotes
   		first mammals
   		first tetrapods
   		first sarcopterygians

1 points   

QUESTION 16

1. A secondary palate is found in all:

   		sarcopterygians
   		tetrapods
   		amniotes
   		mammals

1 points   

QUESTION 17

1. Air sacs originated in the first:

   		gnathostomes
   		osteichthyans
   		sarcopterygians
   		tetrapods

1 points   

QUESTION 18

1. The stapedius is innervated by cranial nerve number:

   		VII
   		V
   		IX
   		X AND XI

Answer 1

1. Answer: Tetrapods

Explanation: Tetrapods are the first species walk on the land and they are land vertebrates it consist of five segments of vertebrae it includes lumbar region without ribs.

2. Question 16 Answer: Amniotes

Explanation: Secondary palate is present in Amniotes to separate the nasal passage and the oral cavity.

3. Question 17 Answer: Osteichthyans

Explanation: Osteichthyans is the first species that respire through the small air sacs.These are first species respire through air sacs. The example of Osteichthyans is lung fish.

4. Question 18 Answer: VII

Explanation: Stapedius is the muscle which is supplied by cranial nerve VII that is facial nerve.