Question

Three things are necessary for humans to keep

their balance while walking on two legs.
The head should be positioned in the upper
of the body.
The weight of the centerbody should be over
the pelvis.
The upper n eed to be stable enough to
support the body's weight.

Answer 1

The head should be positioned in the MIDDLE, CENTER of the body

The weight of the UPPER body should be over the pelvis.

The LEGS, KNEES need to be stable enough to support the body's weight.

Step-by-step explanation:

The first answer will take both middle and center along with the last answer taking both legs and knees, so pick your poison :)