Gases in both Earth's atmosphere and oceans have changed over its history. Scientists noted oxygen spikes in both the oceans and the atmosphere that coincide with changes in species on Earth. They report that the first oxygen spike resulted in a change from the microscopic life forms of 635 million years ago to large algae around 551 million years ago. A second oxygen spike occurring around 550 and 542 million years ago, according to the fossil records, resulted in an increase in?
Answers
The second spike in oxygen coincides with a dramatic increase in species of large complex algae.
"Both oxidation events appear to coincide with increased diversity of fossils assemblages in the Doushantuo basin, with the number of species nearly doubling," McFadden said.
Following this second oxidation event, between 550 and 542 million years ago, there was a worldwide increase of Ediacara organisms, complex macroscopic life forms, an event recently dubbed as the Avalon Explosion. "This was when we see the first burrowing animals and biomineralizing animals in the fossil record," McFadden said. Biomineralizing animals are the first animals to form external skeletons, or shells.
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Answer:
The second oxygen spike that occurred around 550 and 542 million years ago led to worldwide reduction in organic carbon reservoir.
Explanation:
It also led to the fully oxidizing state of the oceans.
Then followed the evolution and diversification of all world animals.
The rise in the oxygen levels favoured living organisms since it was their breathing gas, this saw them evolve for the better.