What is the ABO blood classification based on? antibody on the red blood cell
antigen in the blood
antigen on the red blood cell
hemoglobin in the blood

Which best explains how this maneuver unblock a person's airway?

For a comparative or experimental investigation, scientists often make a testable about a scientific question, and then they test it in the investigation. a. control b. hypothesis c. procedure d. system

Consider the following planned experiment. factor experimental group control group light exposure tots of sun tots of sun amount of water weekly weekly type of soil nutrient rich nutrient rich size of pot large which variable is being tested in this experiment? small a. size of pot b. type of soil c. light exposure d. amount of water