the number of bones in an adult

• 160

• 250

• 206

• 107

places where bones join together

• ligaments

• cartilage

• bones

• joints

Where is cartilage found?

• inside bones

• on the outside of bones

• in muscles

• in your ear

Why is bone marrow important?

• it makes bones

• it makes blood cells

• it makes cartilage

• it is not important

What are the two types of joints?

• movable and immovable

• rough and smooth

• straight and curved

• brown and white

What do you call the human skeleton because it is inside the body?

• exoskeleton

• endoskeleton

What do you call the hard outer layer of bone?

• cartilage

• compact bone

• cancellous bone

• bone marrow

What do you call the spongy material inside your bones?

• cancellous bone

• compact bone

• bone marrow

• cartilage

What are bones made of?

• calcium

• carbon

• oxygen

• blood

What are the two types of bone marrow?

• red and blue

• red and green

• yellow and green

• red and yellow