4. The blood vessels, heart and the blood make up O a. 1/3 of our body
b. the respiratory system
c. 1/4 of our body
d. the cardiovascular system

Forgot the question hahaha

You can still be friends with each other. you don't have to date since he likes someone else. just stick to being friends for now

Your awser would be a acetone

Answer:             1.0  × 10⁻⁵ msolution:                     as we know ph is given as,                                    ph  = -log [h⁺]and,                                    [h⁺]  =  10^-ph    (1)putting value of ph in eq. 1,                                    [h⁺]  =  10⁻⁵                                    [h⁺]  =  1.0  × 10⁻⁵ m