Which is the source of energy in the biosphere?
What are insecticides?
Plants which grow in shade are called ........
Bio-magnification means ......
Zoos are examples for ..........
The temperature of two cups of coffee are 90°C and 75°C . If the time taken for the first cup to cool from 90°C to 80°C is 15 minutes, then the time taken for the second cup to tool from 75°C to 65°C will be: