What is the main difference between an exoskeleton and an endoskeleton?

An exoskeleton is a hard outer skeleton, while an endoskeleton is a hard inner skeleton.

Describe the roles of osteoblasts and osteoclasts in bone remodeling.

Osteoblasts build new bone tissue, while osteoclasts break down old or damaged bone tissue.

I can identify the major bones and muscles in common farm animals.

1
The skeletal system includes bones and connective tissues such as ligaments, which connect bone to bone, and tendons, which connect muscle to bone.
2
The human skeleton is divided into the axial skeleton, which includes the skull and vertebral column, and the appendicular skeleton, which includes the bones of the arms and legs.
3
Osteoblasts are cells that make bone, while osteoclasts are cells that break down bone during a process called bone remodeling.