Why are there so few insects in the sea?

11th March 2010
Why are there so few insects in the sea? (iStock)

Asked by: Steve Dawes, Birmingham

By the time insects evolved, the sea was already full of fish and predators. Insects’ respiratory systems rely on having air inside all the time, so they can’t dive deep enough to avoid being eaten. Another theory is that their survival depends on flowering plants. And as there are no flowering plants in the sea, there are no insects.

 


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