'Almost all sharks have 5 of these "slits"; & some don't have to swim constantly to pump water over them'
gills
SHARK!: Almost all sharks have 5 of these slits; & some dont have to swim constantly to pump water over them
Almost all sharks have 5 of these "slits"; & some don't have to swim constantly to pump water over them
Almost all sharks have 5 of these "slits"; & some don't have to swim constantly to pump water over them
SHARK!
gills
SHARK!