Question

question 5 (mandatory) (2 points) retake question the vertebrate lung first appeared in __________. a) fishes b) amphibians c) reptiles d) birds e) mammals

Explanation:

Lung - like structures first evolved in some fish species (such as lungfish). These structures were an important precursor to the more developed lungs in other vertebrates. Amphibians, reptiles, birds, and mammals evolved after fish, and their lung structures are more complex but trace back to the early developments in fish.

Answer:

A. Fishes