During a hurricane a small population of a species of bird is carried to a nearby island where this species is not found. The island population subsequently diverges from the ancestral population and becomes a new species. This is an example of:.
A. sympatric speciation
B. parapatric speciation
C. the peripheral isolate model of allopatric speciation
D. the vicariance model of allopatric speciation
E. the hybrid zone model of speciation

bacterium is not correct

answer-

the statement that f(x) = |x+a| + b has exactly one x-intercept is sometimes correct.

solution-

it solely depends on b, whether the function will have one or two or zero x intercept.

this plot of the given function, f(x) = |x+a| + b will be the basic absolute value graph i.e v shape, with vertex translated to (-a, b), instead of origin.

1-   if b is zero, the graph will have exactly one x-intercept, at x= -a

2- if b is positive, the whole graph will be above the x-axis, hence it will have no x-intercepts.

3- if b is negative, the graph will be below the x-axis, hence it will have two x-intercepts.

∴ the statement is sometimes true.