If blood is in short supply which blood type would be the most beneficial to have on hand if someone needed a blood transfusion?

How are tumors cells different from normal cells

Which of these parts of the membrane large moecules pass through it ?

Which of the following types of pollution is most responsible for large numbers of deaths worldwide because of unsafe drinking water? (a) nutrient pollution (b) thermal pollution (c) pathogen pollution (d) sediment pollution