Question

Complex organisms with gills and lungs were major life forms that existed in the_____________. a. Mesozoic era c. Precambrian era b. Cenozoic era d. Paleozoic era Please select the best answer from the choices provided A B C D

Answer 1

Answer: Paleozoic era

Step-by-step explanation:

Answer 2

D

Step-by-step explanation:

Complex organisms with gills and lungs were major life forms that existed in the Paleozoic Era. The answer is D.