#gills

ac_unit  Can you tell the age of a fish by the size of its gills?

The size of a fish's gills cannot be used to accurately determine its age. While the size of a fish's gills does change as it grows, it is influenced...    Read more

pets  Can you tell the age of a salamander by the size of its gills?

The size of a salamander's gills cannot be used to accurately determine its age. While a salamander's gills do change as it grows, there are many...    Read more

water  How do crabs breathe underwater?

Crabs and other crustaceans have adapted to their underwater environment in a number of ways, one of which is how they breathe. Unlike humans, who...    Read more

waves  How do fish breathe underwater?

Fish are aquatic animals that breathe underwater through a process called respiration. Unlike humans and other mammals, fish cannot extract oxygen...    Read more