To determine which organ is most responsible for gas exchange in White-Throated Snapping Turtles while they are underwater, we can look at the options provided:
A. Skin B. Lungs C. Cloaca D. Mouth and Nose
Among these options, the Cloaca is particularly important in some turtle species for gas exchange when submerged. Certain turtles can utilize their cloacal bursae to absorb oxygen directly from the water.
Therefore, the best response based on the characteristics of White-Throated Snapping Turtles and their behavior while underwater is:
C. Cloaca