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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
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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

User Steve Lillis
by
4.8k points

1 Answer

7 votes

Answer:

D which is that Paleozoic era

Step-by-step explanation:

Paleozoic era

User Mike MacMillan
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4.9k points
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