Abstract Background Wireless body area networks are created to retrieve and transmit human health information by using sensors on the human body. Energy efficiency is considered a foremost challenge to increase the lifetime of a network. To deal with energy efficiency. one of the important mechanisms is selecting the relay node. https://www.markbroyard.com/great-pick-tablecraft-invertatop-squeeze-bottle-24-oz-translucent-12-pack-cheap-limited-save/