The evolution of this construct is sometimes cited as a cause of the Cambrian explosion.
The evolution of this construct is sometimes cited as a cause of the Cambrian explosion. Because of their toughness, these constructs are often used paleontologically to examine animals. Ecdysis occurs when an animal sheds one of these, which allow it to grow. All arthropods possess one of these.However, some animals, such as clams, have no need to do so—they simply add new material to the old one. Name this hard, external covering that is composed of chitin and can be strengthened with calcium carbonate, sometimes contrasted with endoskeletons.
The evolution of this construct is sometimes cited as a cause of the Cambrian explosion.
{exoskeleton}