Which of the following must be true of a population in genetic equilibrium?
a. migration between populations
b. small population size
c. random mating
d. sexual selection

C. Random Mating 
The gene pool of a population is said to be in Hardy-Weinberg equilibrium if there is no migration in or out of the population ( no gene flow), There are no mutations, no natural selection, The population is large enough to avoid genetic drift and the mating is random (not sexual selection)

CH3COOH is considered an organic compound since it contains a chain of carbon. An organic compound is a class of organic compound that contains one or more carbon atom covalently linked to other elements. Inorganic compounds, on the other hand, is a compound that doesn't necessarily have a carbon atom.