Eggs are the 'go-to' way for evolution to send genetic lines forwards in time, allowing for unique individuals to arise through sexual reproduction.
The evolution of the first eggs may be intimately tied to the birth of life as we know it, paving the way for genetic diversity.
Without sex, and by extension eggs, individuals would likely die out more frequently due to viruses and other vulnerabilities.
600 million years ago, fossils suggest that the first eggs were very different and laid by jellyfish or worm-like creatures.
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