Answer:
The best statement which can support the theory that newt may have evolved from certain types of fish is - newt and fish have similar body structure.
Explanation:
By comparing the anatomy and morphology of organisms we can trace the evolutionary relationships. Morphology is the study of external structure of an organism and anatomy is the internal structure of an organism. By comparing the morphology and anatomy, we can find the similarities and differences between the present and the extinct organism. If two organism show similarity in structure or function they are supposed to have evolved from common ancestor.
If two organisms have similar anatomy but perform different function then they are called homologous structures. For example: Pattern of arrangement of bones of forelimbs in whales, bat, cheetah, and human. All of these are different species of the same class mammalia. They have similar anatomy of forelimbs but perform different functions. In humans its for holding objects, in cheetah for running, in whale its for swimming and in bats its for flying.
So to support the theory that newts have evolved from some fishes, they must have some similarities in their morphology or anatomy.
