During the Cambrian explosion approximately 535 to 525 million years ago, 1.all modern species of animals suddenly appeared. 2.animals rapidly diversified in the oceans. 3.a massive volcanic eruption nearly wiped out life on Earth. 4.great forests produced peat layers that were later transformed into coal.

During the Cambrian explosion approximately 535 to 525 million years ago, 2. animals rapidly diversified in the oceans

Explanation:

Scientists have the theory that the Cambiran explosion, approximately 535 to 525 million years ago, was possible because of complex predator-prey relationships and increased atmospheric oxygen levels. All this situation promoted animal diversification. Thinking about evolution, animals directly evolved from protists.