Which labels best complete the diagram?

X: Two-chambered heart
Y: Swim bladder
X: Single-chambered heart
Y: Swim bladder
X: Gills
Y: Lateral line
X: Lungs
Y: Lateral line

Which labels best complete the diagram X Twochambered heart Y Swim bladder X Singlechambered heart Y Swim bladder X Gills Y Lateral line X Lungs Y Lateral line class=