What causes water to become denser when it is carried to the poles by surface currents?

increased temperature and increased salinity
decreased temperature and decreased salinity
increased temperature and decreased salinity
decreased temperature and increased salinity

Which conditions need to be in balance for cells to function? check all that apply. blood sugar food intake body water body temperature body mass

What are the most explosive events that occur on the sun? umbras solar flares solar winds prominences

Which of the following statements is true regarding a basic amino acid? a.) the hydrophilic r group of a basic amino acid will be located on the interior of a protein b.) the positively charged r group of a basic amino acid could bind dna c.) the r group of a basic amino acid would only be able to form covalent bonds with other molecules d.) a basic amino acid would be considered both polar and hydrophobic e.) all of the above