The unique properties of water are due to the of water molecules and the ability of water to form with other water molecules and with other polar molecules.
polarity; hydrogen bonds
polarity; polar covalent bonds
hydrophobicity; hydrogen bonds
electronegativity; polar covalent bonds

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

c: warm water flows from the western tropical pacific toward south america. that should be the right answer! hope it .