Which bone is identified in the picture below

The labelled bone is Humerus.

Explanation:

The given picture represent the skeleton system of human. In this the bone of the upper arm is highlighted. the bone of the upper arm is known as humerus. The humerus is joined to shoulder bone on the upper end and at the lower end, it is joined to radius and ulna. It is a single long cylindrical bone. that forms the ball socket type shoulder joint and hinge type elbow joint.

d. planting trees

the trees take in carbon to make oxygen.