Match the bones with their joints.
1. knee pelvis and femur
2. hip scapula and humerus
3. shoulder femur and tibia
4. elbow humerus, radius and ulna
5. sacroiliac sacrum and ilium

Knee joint - femur and tibia.

Hip joint - pelvis and femur.

Shoulder joint - scapula and humerus

Elbow joint - humerus, radius and ulna

Sacroiliac joint - sacrum and ilium.

The joints are defined as the connection between two adjacent bones which makes different structures. Joints are of different types - some are movable, while some are immobile.

The knee joint is a hinge joint which is a movable joint between the femur and tibia. This joint has synovial capsule, as well as synovial fluid to help in the movement. Knee joints are movable only in one axis.

Hip joint is also a mobile joint, between the femur and the acetabulum cavity of pelvis. This joint is a ball and socket joint, movable in all axis.

Shoulder joint is very similar to hip joint, being synovial joint. This joint is between the facet of scapula and humerus. This joint is the most movable joint of a human body, being able to rotate a complete of 360°.

Elbow joint is very similar to knee joint, which is also a movable joint between the humerus and radius- ulna. It's also a hinge joint, movable in one plane.

Sacroiliac joint is an immovable joint between the sacrum and ilium, which joins the pelvis with the vertebral column. This joint isn't a synovial joint.

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carbon atoms, hydrogen, oxygen, and nitrogen.