Bioaccumulation is the process by which chemicals are stored in the tissues of living organisms. It is the accumulation of chemicals in the tissue of organisms through any route including, respiration, ingestion or direct contact with contaminated water, sediment and pore water in the sediment. These chemical substances include, pesticides or other chemicals.
Temperature is related to heat by science
cholesterol in the cell membrane is to maintain stability, anchor other molecules, and keep the membrane fluid in cold temperatures.
Each hydrogen bond will form ONE COVALENT bond with the other atoms in the molecule. Hydrogen has only one atom; to form a covalent bond, it has to donate one electron and the other atom that hydrogen is bonding with will donate one electron also, making two. These two electrons will be shared between the two, making the atoms to have two electrons each.