Number of bones in adult human body are :

206
216
226
270

The correct answer is (a) 206.

The human skeleton is made up of 206 bones. These bones are divided into two main groups: the axial skeleton and the appendicular skeleton. The axial skeleton includes the skull, the spine, the ribs, and the sternum. The appendicular skeleton includes the arms, the legs, the hands, and the feet.

The bones in the human body are constantly being remodeled. This process of remodeling is necessary to maintain the strength and health of the bones. The bones are also constantly being replaced. New bone is formed to replace old bone that has been lost due to injury or disease.

The bones in the human body are very important. They provide support for the body, protect the organs, and allow for movement. The bones are also involved in the production of blood cells and the storage of minerals.

Here is a brief description of each option:

(a) 206: This is the correct answer. The human skeleton is made up of 206 bones.
(b) 216: This is incorrect. The human skeleton is not made up of 216 bones.
(c) 226: This is incorrect. The human skeleton is not made up of 226 bones.
(d) 270: This is incorrect. The human skeleton is not made up of 270 bones.