What would this one be please help me i’ll give you brainlist

It would be A

Explanation:

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where is the diagram?

if you insert the diagram ill be able to you

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands