How many square centimeters are in an area of 5.90 inch^2 ?

This drawing shows a human body system. what is the primary function of this body system?

Which statement is true about hcl? (5 points) select one: a. it is a salt because it increases the concentration of metallic ions. b. it is a salt because it is formed by the reaction of an acid and a base. c. it is an acid because it increases the concentration of hydroxyl ions. d. it is an acid because it increases the concentration of hydronium ions.

May someone me with these science questions