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serious [3.7K]
3 years ago
10

Mammalian evolution began with the evolution of the first synapsids. What is the defining synapomorphy of synapsis?

Biology
1 answer:
Feliz [49]3 years ago
4 0

Answer:

b. a single temporal fenestra

Explanation:

Synapsids have a temporary fossa in the lower part of the temporal bone. These reptiles mamiferoides only have a single inferior temporal fenestra.

The synapsids were the first amniots to diversify and appeared  in the middle of the Carboniferous. These first synapses were characterized by the presence of a single temporary fenestra behind each orbit, through which the mandibular muscles pass.

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