A sphere with a radius of 4.5 cm

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

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)

The atomic number, or number, is the described as the number of in the nucleus of an chemical element.