Question

1) true or false, the lungs of a frog are supplied by the pulmonary arteries, vessels derived from the first aortic arches

2) describe the history of a living lobe-finned fish, the coelacanth. what is the evolutionary significance of this group?

Answer 1

Ans: (1) No, it is false.

The correct answer is the lungs of a frog are supplied by the pulmonary arteries, vessels derived from the sixth aortic arches.

(2) Lobe-finned fishes (sarcopterygians) and their relatives the ray-finned fishes (actinopterygians) comprise the superclass of bony fishes (Osteichthyes) characterized by their bony skeleton rather than cartilage. There are otherwise vast differences in fin, respiratory, and circulatory structures between the Sarcopterygii and the Actinopterygii, such as the presence of cosmoid layers in the scales of sarcopterygians. The earliest fossils of sarcopterygians, found in the uppermost Silurian (ca 418 Ma), closely resembled the acanthodians (the "spiny fish", a taxon that became extinct at the end of the Paleozoic). In the early–middle Devonian (416–385 Ma), while the predatory placoderms dominated the seas, some sarcopterygians came into freshwater habitats.

The living non-tetrapod sarcopterygians include two species of coelacanths and six species of lungfish.