Which of the following are thought to have occurred because of the increase of oxygen (O2) in the atmosphere during and after the Silurian Period?
A) Conquest of land by arthropods.
B) Conquest of land by arthropods and vertebrates.
C) Increases in animal body sizes and conquest of land by plants.
D) Conquest of land by arthropods and vertebrates, and plants.
E) Conquest of land by arthropods and vertebrates and an increase in animal body sizes.
Correct Answer:
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