Answer:
It is a route in which N2 in the atmosphere is converted into ammonia by prokaryotes using an enzyme complex (Nitrogenase), and an N pool is maintained in the ecosystems, which replenishes N losses. BNF occurs naturally in the soil by N fixing bacteria (Rhizobium and legumes/Azotobacter)
Answer:
minerals are not man-made. They are naturally occurring. Minerals concocted in the the lab do not count although there are about 208 man made minerals discovered around mines
The answer is: D - none of the above.
Scientists want to learn about life on Earth long ago, so they dig for fossils. A fossil is what is left from a living thing that died long ago. Most fossils are found in layers of rocks. Most form after a plant or an animal dies and is covered rapidly with dirt and sand.
Hari passed the exam but Sheela didn't.
