Wireless Sensor Networks (WSNs) have been widely considered as one of the most important technologies for the 21st century and have been proposed for variety of applications such as environment, health, military, and traffic control, industrial and commercial applications. In all these applications, energy usage is the determining factor in the performance of wireless sensor networks. Accordingly, methods of data routing and transferring to the base station are very important because the sensor nodes run on battery power and the energy available for sensors is limited. Energy efficiency is...