Water is a polar molecule. since oxygen has a slight negative charge and each hydrogen has a slight positive charge, this allows water molecules to form covalent bonds with other water molecules. form van der waals bonds with other water molecules. form hydrogen bonds with other water molecules. form ionic bonds with other water molecules.

Form hydrogen bonds with other water molecules

Explanation:

Since the molecules of water have dipoles, they act like magnets attracting opposites. The hydrogen end (partially positive)of one molecule attracts the oxygen end (partially negative) of the next molecule. The dipole-dipole forces between these molecules are what form the hydrogen bonds because it involves a hydrogen atom. Hydrogen bonds are a part of Van der Waals forces.

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are  important factors here. as a cell increases in size, its surface area and volume increase as well.  we call that the surface area to volume ratio (sa: vol).  but the catch is that  volume increases at a greater rate than surface  area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow!   check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!