The answer is B. Selection for two extreme variations of a trait
Disruptive selection : changes in population genetics in which extremes value of a trait over intermediate Value
By selecting two extreme variations of the trait, in will be categorized as Directional Selection, nor disruptive selection
A monarchy is a government that would share the characteristic of being ruled by a single leader.
The vice president becomes president
In a fully developed use case description the postcondition data describes the existence of domain model objects.
A postcondition in computer programming is a condition or predicate that, immediately following the execution of a certain line of code or an action in a formal specification, must always be true. In some cases, code-based assertions are used to test postconditions. Postconditions are frequently just listed in the affected code section's documentation.
Postconditions, together with preconditions and class invariants, are elements of the programme construction process design by contract in several software design methodologies.
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