Jaws are believed to have evolved from the
A) cranium.
B) first ribs.
C) first pair of gill arches.
D) tooth buds.
E) suckers of lampreys.

Question

Quizplus · Accepted Answer

Jaws are believed to have evolved from the first pair of gill arches, which are the skeletal elements that support the gills in fish. Over time, these arches became modified and specialized to form the jaw structures seen in modern fish and other vertebrates. This theory is supported by developmental and genetic evidence as well as fossil record.

Jaws Are Believed to Have Evolved from the