Science and History

The Oxygen Needed for Complex Life to Emerge in the Oceans was ‘Patchy’

November 22, 2025 by Robert

Research has shown that animals emerged between 1.8 billion and 600 million years ago. No wonder oxygen is necessary for complex life such as animals.

Previous research found that oxygen levels needed to rise high enough to support complex life forms. Lower and less complex lifeforms like sea sponges can live in lower oxygen levels. But complex life, like vertebrates and mammals, needs much higher oxygen levels.

New research into fossil records shows that oxygen in the oceans rose in temporary hotspots and shifted. Scientists have concluded that pockets of high oxygen level ocean water were first seen in the tropics and then shifted to the poles. These pockets of high oxygen moved regularly. Only the organisms most able to adapt and evolve were able to survive. Any microorganisms that started to develop in the tropics were in a challenging situation.

Oxygen needed for complex life

In conclusion, these shifting pockets of oxygen lead to the great diversity of animal life we now enjoy. As the oxygen levels shifted, new forms of animal life developed for that level. And then it was forced to evolve, over and over again, creating incredible diversity.

Recent research suggested this process may have started as long as 3.2 billion years ago with oxygen levels beginning to soar around 2.4 billion years ago.

But it was not until between 1.8 billion and 600 million year ago that the first animals are thought to have emerged.

The work by Dr Reinhard and his colleagues now helps to explain that this was probably due to the way in which oxygen was absorbed by and dissolved in the oceans.

— DailyMail.co.uk

This research, like so many others, how much we as complex human animals need good oxygen levels to sustain our lives and thrive. And liquid oxygen drops can help boost your oxygen levels and help your complex life.