A water molecule, because of its shape, is a polar molecule. That is, it has one side that is positively charged and one side that is negatively charged. The molecule is made up of two hydrogen atoms and one oxygen atom. The bonds between the atoms are called covalent bonds, because the atoms share electrons
Legumes are planted so as to help the land replenish nitrogen. Without it the soil would be bad and plants that need nitrogen from land, just like we do, would not be able to grow successfully.