Based on the phylogenetic tree in Fig. 23.22, what character did the last common ancestor of both reptiles and mammals NOT possess?
A)lungs
B)four limbs
C)amniote embryos
D)mammary glands
E)The last common ancestor of reptiles and mammals possessed all of these traits.

Question

Based on the phylogenetic tree in Fig. 23.22, what character did the last common ancestor of both reptiles and mammals NOT possess? 
A)lungs 
B)four limbs 
C)amniote embryos 
D)mammary glands 
E)The last common ancestor of reptiles and mammals possessed all of these traits.

Quizplus · Accepted Answer

Mammary glands are a specialized feature found only in mammals and not in reptiles. Therefore, the last common ancestor of reptiles and mammals did not possess mammary glands.

Based on the Phylogenetic Tree in Fig