Which is not a characteristic of a compound? A.) different samples have different properties

B.) has different properties from its component elements

C.) a pure substance made of two or more elements

D.) can be represented by a chemical formula

Iwill give extra points to who gets this right

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

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.