Marine phytoplankton, magnified 400 times. Ekky Ilham/Shutterstock Britain’s seas are rich in wildlife, but many of its species can only

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Marine phytoplankton, magnified 400 times. Ekky Ilham/Shutterstock Britain’s seas are rich in wildlife, but many of its species can only
Choksawatdikorn/Shutterstock If you go to the beach and dip a bucket in the sea, you might at first think it