Option 1: King Cobras are reptiles and most reptiles have a three-chambered heart. They lack the complete septum, or division, between the ventricles.

Option 2: Turtles, being reptiles, also generally have a three-chambered heart. They too lack the full division between the ventricles.

Option 3: Chameleons, as a type of lizard, also fall in the category of reptiles. Therefore, they have a three-chambered heart similar to other reptiles.

Option 4: Crocodiles are unique among reptiles because they have a four-chambered heart. It`s similar to the hearts of birds and mammals, which allows them to maintain higher activity levels. This is why crocodiles are the correct answer.