Retin-A (tretinoin) is a form of vitamin A that helps the skin renew itself. The Retin-A and Avita brands of tretinoin are used to treat acne. The Renova brand of tretinoin is used to reduce the appearance of fine wrinkles and mottled skin discoloration, and to make rough facial skin feel smoother. Retin-A may also be used for purposes not listed in this medication guide.
Waste Stream. The total flow of solid waste from homes, businesses, institutions, and manufacturing plants that is recycled, burned, or disposed of in landfills, or segments thereof such as the residential waste stream or the recyclable waste stream..
Report Abuse. A stream is a body of running water such as a river or brook. As the stream of water flows downhill it may begin cutting into the soil and gradually get wider, deeper, longer and become a river.All rivers are fed by smaller streams or channels. By definition a stream becomes a river according to its volume.eport Abuse. A stream is a body of running water such as a river or brook. As the stream of water flows downhill it may begin cutting into the soil and gradually get wider, deeper, longer and become a river.