Environmental Science...help!!! Hi, Anyone knows the answer to this questions? 1) Solutions are always comprised of: a)water and salts b)solvents and solute c)compounds and ions d)liquids and solids 2)Plants get the nitrogen they need to build additional cells from: a)directly from the nitrogen in the air b)protein in the cells c)ammonia or nitrate in the soil d)denitrifying bacteria 3)Ammonia (NH3) is converted to nitrite (NO2) by: a)nitrifying bacteria b)decomposers c)denitrifying bacteria d)nitrogen-fixing bacteria 4)Phosphorus is needed by organisms for a)bones b)cell membranes c)DNA d)All of the above are correct. I take any help you can give me. Thank you very much!!!!