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What terms includes the other threeskull spine pelvis or endoskeleton?

The term "endoskeleton" includes the others (skull, spine, and pelvis) because it refers to the internal framework of bones that provides support and protection to the body. The skull, spine, and pelvis are all examples of bones that make up the endoskeleton.


What first organisms developed a hardened endoskeleton?

The first organisms to develop a hardened endoskeleton were likely ancient invertebrates called echinoderms, such as sea urchins and starfish. Their endoskeleton is made of plates composed primarily of calcium carbonate. This adaptation provided structural support and protection as these organisms evolved to live in various marine environments.


What is the opposite of an exo-skeleton?

The opposite of an exoskeleton (outer shell-like support structure eg insects, arachnids) is an endoskeleton (inner structure, such as mammals and reptiles have.)


What type of skeleton do vertebrates such as humans have?

Humans and other vertebrates have an endoskeleton, which is an internal framework of bones that provides support, protection, and structure to the body. The endoskeleton allows for movement and growth as well as serving as a site for muscle attachment.


The human skeleton is an what skeleton?

Humans have endoskeletons, which means their skeletons are contained within their bodies, and mostly made of bones. This is in contrast to exoskeletons, which are the outer shelling of the creature and made of more flexible material.