Well, I think it's mainly for photosynthesis and gas exchange. A leaf is normally flat, light, and thin, so that the sunlight can get to the chloroplasts in the cells.
Since nonmetals have five, six, or seven electrons in their valence shells, it takes less energy to gain the necessary electrons, and therefore form anions.
M=(mols/L) so M=(9.0/2.5) which is 3.6M
Answer: It's 2:2
Explanation: you can look at the coefficient stands in front of the chemical
For example if they ask the ratio of oxygen to sulfur trioxide, it would be 3:2 and vice versa vv..
