Final answer:
Non-heritable variation can be either continuous or discontinuous, with discontinuous variation involving sudden changes.
Step-by-step explanation:
Non-heritable variation can be either continuous or discontinuous, depending on the type of trait being observed.
Continuous variation involves gradual changes over time and is seen in characteristics like human height, where there is a range of small differences among individuals.
Discontinuous variation, on the other hand, involves sudden changes and is observed when each individual shows one of a few easily distinguishable traits, such as violet or white flowers.
Therefore, the correct answer is 2) Discontinuous because it involves sudden changes.