explain the problem of ozone depletion
what is latent heat of vaporization?
where plants recieve their nutrients mainly form
what is the law of conservation of mass?
what is evaporation explain with an example?
Complete the series. 9 = 4, 21 = 9, 22 = 9, 24 = 10, 8 = 5, 7 = 5, 99 = 10, 100 = 7, 16 = ?, 17 =?
what is nitrogen cycle explain in detail?
How does an amoeba obtain its food?