How do hydroelectric dams emit greenhouse gases like methane without burning any fossil fuels?

Its either a) or b),wind and water erosion gradually widen the canyon

Ifound this information on google “yes. they have a mouth and brain at one end and an anus at the opposite end. what characteristics distinguish an annelid from other worms? annelids have segmented bodies and a coelem which is a tube filled with fluid and contains most of the organs.“ i hope it you