If you had to guess. am I pretty? how old am I? what age am I? and what color are my eyes?

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

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