#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