The closest living ancestors of birds are crocodilians. What provides morphologi
ID: 49849 • Letter: T
Question
The closest living ancestors of birds are crocodilians. What provides morphological evidence for this relationship?
both are homeothermic
both have extensive air sac system
both have a 4-chambered heart
both have differentiated teeth
none of the above
I think it is related to teeth, but I cannot find the reason for it. Help!!
What support can be provided for the argument that hagfish are not fish?
they are found only in seawater
they lack jaws
they are found only in freshwater
they lack gills
I think it is because they lack jaws.
Is it correct?
both are homeothermic
both have extensive air sac system
both have a 4-chambered heart
both have differentiated teeth
none of the above
Explanation / Answer
1. Both birds and crocodiles have a four chambered heart.
2. Hagfish lack jaws. Though hagfish ressemble eels, they lack vertebral column. They have skulls, but lack jaws.
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