55 points take the or whatever but Im getting head on my 15th bday on march 26th gonna be great also help me Two or more substances dispersed in one another but each retaining their own identity is a . substance
mixture
solute
compound

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange