The color pattern in which marine organisms are light on the bottom and dark on the top of their bodies camouflaging them against the water-air interface is

countershading

Explanation:

This is a type of protective camouflaging used by marine organism whereby they are light at the bottom and dark on top.

They have got receptors in their body which help helps them to camouflage their upper and lower half body using a distinctive colour pattern.

answer; wireshark;

b. xor is the correct answer