U.S. Efforts to Make Bio-waste Fuels

According to Xinhua News Agency, Washington, July 25 (Reporter Wang Zhenhua) Oil, coal, and natural gas are essentially plants, but these plants were buried underground before being rotted and turned into a long-term stratum temperature and pressure. At present, people use the energy extracted

Knowledge about Bullfrog Breeding

1. Identification and selection of male and female frogs Sexually mature male and female bullfrogs are clearly different in appearance. The tympanic membrane diameter of the male bullfrog is significantly larger than the diameter of the eye; for the forehand, the inside of the forehand has a w