Building a dam alters the water regime down the dam. The dam also affects fish migration along the river, alters the transportation of sediments by the river downstream, and changes temperatures within the local environment of the dam. These changes, however, the subtle effect the ecosystem around the dam and down the river. The potential energy of the water held by the dam is, however, high and used to produce more electricity.
The chicken wing we received was from the left side because we held it up like it was attached to one of our bodies and the tip was like the human fingertips, and the joint was like the human shoulder joint.