Pls help!! What volume is represented by each small tick mark? (look at attachment)

Which statement describes both homogeneous mixtures and heterogeneous mixtures?

If a solution is considered basic, then a) the hydroxide ion and hydronium ion concentrations are equal. b) the hydroxide ion concentration is less than the hydronium ion concentration. c) the hydronium ion concentration is greater than the hydroxide ion concentration. d) the hydroxide ion concentration is greater than the hydronium ion concentration.

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?