Why life on Earth first got big

Some of the earliest complex organisms on Earth—possibly some of the earliest animals to exist—got big not to compete for food, but to spread their offspring as far as possible.

4 billion years: World's oldest fossils unearthed

Remains of microorganisms at least 3,770 million years old have been discovered by an international team led by UCL scientists, providing direct evidence of one of the oldest life forms on Earth.

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