Worms’ sex life yields advantage over parasites

Sex gives worms the power to fight off parasites, report researchers this week in the journal Science.

Worms forced to reproduce asexually succumbed to a nasty bacterial infection and died.

The researchers say the results are the most convincing evidence to date for a key theory in evolutionary biology.

The theory holds that sex evolved because it lets organisms reshuffle their genes into new combinations to stay a step ahead of parasites.

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