A group of similar classes forms a phylum. The classification of organisms helps in the their study. Many reptiles are ectothermic. Most sharks are cold-blooded, only a few, like the Mako and the Great white shark can raise their temperature above that of the water. The two animals are called commensals.
Commensalism is a type of symbiosis .
It has small jaws, but can use its tail to corral and even kill fish. It is a very strong swimmer and can even leap out of the water. It lives in tropical and temperate waters, including the eastern and western Atlantic, the central Pacific, and the Indo-west pacific. A consumer is a living thing that eats other living things to survive. Primary consumers eat producers, secondary consumers eat primary consumers, and so on.