Why did invertebrates, particularly arthropods, get so large in the Late Paleozoic?
A)There was more moisture in the atmosphere.
B)Ozone in the atmosphere shielded them from ultraviolet radiation.
C)There was more vegetation for them to feed on.
D)There was more oxygen in the atmosphere.

Question

Quizplus · Accepted Answer

The best explanation for the large size of invertebrates, particularly arthropods, in the Late Paleozoic is that there was more oxygen in the atmosphere. This allowed them to grow larger and more metabolically efficient.

Why Did Invertebrates, Particularly Arthropods, Get So Large in the Late