Most autotrophs use water as the reducing agent, but some can use other hydrogen compounds such as hydrogen sulfide. Phototrophs (green plants and algae), a type of autotroph, convert electromagnetic energy from sunlight into chemical energy in the form of reduced carbon.
Athens is a city in and the county seat of Athens County, Ohio, United States. It is located along the Hocking River in the southeastern part of Ohio. A historic college town, Athens is home to Ohio University (26,000+ students) and is the principal city of the Athens, Ohio Micropolitan Statistical Area. The official population of Athens in the 2010 U.S. Census was 23,832.
Athens County is a county located in the southeastern part of the U.S. state of Ohio. As of the 2010 census, the population was 64,757. Its county seat is Athens. The county was formed in 1805 from Washington County. Because the original state university (Ohio University) was founded there in 1804, the town and the county were named for the ancient center of learning, Athens, Greece. The Athens Micropolitan Statistical Area includes all of Athens County.