The cells of the human body must have a lower sodium ion concentration and a higher potassium ion concentration than the blood carried by the circulatory system. What cellular mechanisms allow human body cells to maintain these
concentrations? Do these examples demonstrate active or passive transport?

what have scientists found to be the most efficient and effective way to insert new sequences into an individual? a-scientists have created genetically altered foods that release dna during digestion. b-scientists use viruses to insert specific gene sequences. c-scientists irradiate genes so that they can be absorbed through the skin.