7th Sciend ch. 8 lesson 1

a framework that shapes and supports an animal, protects its internal organs, and allows it to move in its environment.

• skeleton

• muscles

• cartilage

• joints

What are the types of skeletons?

• skeletons with no hard parts

• exoskeletons

• endoskeletons

• mutlti-skeleton

Which are examples of a skeleton with no hard parts?

• jellyfish

• earthworm

• mollusks and anthropods

• vertebrates

Which are examples of an endoskeleton?

• jellyfish

• earthworm

• mollusks and anthropods

• vertebrates

Which are examples of an exoskeleton?

• jellyfish

• earthworm

• mollusks and anthropods

• vertebrates

Describe the skeleton found in cnidarians and earthworms.

• skeleton with no hard parts; they have fluid-filled cavities surrounded by muscle.

• they have a hard outer shell

• they have an endoskeleton

Animals that have exoskeletons, which have no living cells, must go through a process of _____ in order for the animal to grow. 

• molting

• shedding

• stretching

• pulling

What happens to an arthropod during

molting?

• It sheds its exoskeleton.

• It grows a new appendage.

• It replaces cartilage with bone.

• It contracts its muscles.

Endoskeletons can be made of different materials such as .......

• plates

• cartilage

• bone

• muscle

Cartilage and bone are both made of ________________ which allows them to grow.

• cells

• muscles

• veins

• calcium