Crabs, like many sea-dwelling creatures, have gills that they use to extract oxygen from the water in order to breathe. But you’ve probably seen plenty of crabs on land too. So how does a gilled creature breathe on land?
Crabs, like many sea-dwelling creatures, have gills that they use to extract oxygen from the water in order to breathe. But you’ve probably seen plenty of crabs on land too. So how does a gilled creature breathe on land?