In sharks, the upper lobe of the fin is generally larger and longer than the lower lobe and it speculated that the longer upper lobe generates lift for the swimming shark. The detection of chemicals in an environment. Two types of chemoreceptive organs exist. Sharks primarily rely on their olfactory organs rather than their Gustatory organs. Claspers The sex organs for male members of Chondrichthyes, used for the passing of sperm to a female's organs.
All elasmobranchs have interenal fertilization.
Although there ar e two claspers, only one is used at a time. Countershading A form of camouflage in which either the top or bottom of an animal is lighter or darker than the other side. In aquatic environments, most often the top is darker than the bottom so that the animal will blend in with the ocean depths for a nything looking down on it and will blend in with the reflections of the surface waters for anything looking up at it. Most pelagic sharks are countershaded, including great white sharks . Dermal Denticle Sharks have many rows of enamel covered teeth inside their mouths and these rows extend out of the mouth as well to form the tooth-like scales that cover and protect a sharks body.