Mesomorphs have which of the following body types?
a. muscular and athletic
b. thin and frail
c. large and soft
d. average

A. Muscular and athletic

Explanation:

Human body falls into any of the three body types which are Ectomorph, Endomorph and Mesomorph.

It is not mandatory to fall definitely into one of the categories. Many people show mixed body types. Hence, fitness coach and dietitians usually mark people from 1 to 7 on each category.  

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added