Answer:
Articular cartillage
Step-by-step explanation:
The white substance that reduces friction at the ends of bones is called articular cartilage. Articular cartilage is a smooth, slippery tissue that covers the surfaces of bones where they come into contact within a joint. It acts as a protective cushion, reducing friction and providing a smooth surface for joint movement. Articular cartilage helps facilitate smooth and pain-free movement within joints, allowing bones to glide against each other with minimal friction.