What is the name of the joint between ribs and sternum?
A. Cartilaginous joint
B. Angular joint
C. Gliding joint
D. Fibrous joint

Hint: In the human body, a joint or articulation or articular surface is a physical point of connection between two bones that allow movement, and hold the skeleton together.

Complete answer:
A. Cartilaginous joint- These joints are partially movable, these joints occur only in those regions where the connections between the articulating bones are made up of cartilage. Cartilage provides a smooth and lubricated surface for articulation. Examples include spinal and rib cage, sternum, and ribs.
B. Angular joint- Angular movements are produced when the angle between the bones of the joint changes. There are several angular movements such as extension, flexion, and hyperextension. Examples of flexion include moving the forearm upward at the elbow or moving the wrist to move the hand towards the forearm.
C. Gliding joint- It is a common type of synovial joint (these joints are movable, flexible, rotatable, or can slide over one another). Gliding joint is also known as a planar joint, this joint occurs between the surface of two flat bones which are held together by the ligaments. Examples include the forearm to the wrist and lower leg to ankle joint.
D. Fibrous joint- Fibrous joints are also known as fixed or immovable joints, and these joints are found in the region where bones are not flexible. In these joints, bones are fused together in such a way that they are fixed to that part. Examples include the skull (which is made up of several fused bones and the skull bones are connected by sutures), upper jaw, backbone, etc.

Hence, the correct answer is option (A).

Note: One of the key factors which help in locomotion is bones and muscles. In humans and other vertebrates bones build a framework known as the skeletal system.