The Carbon cycle

May 16, 2019 Sushil Humagain 0

Carbon is a basic component of plants and animals. There is a continuous exchange of carbon dioxide between the atmosphere, aquatic bodies and living organisms. […]

The Nitrogen cycle

May 16, 2019 Sushil Humagain 0

Nitrogen is an essential constituent of plant and animal proteins, vitamins and nucleic acids. The atmosphere is the main source of nitrogen gas which is […]