PLEASE HELP Which of the following increases genetic variation by forming entirely new alleles?

Natural selection
Genetic drift
Mutation
Gene flow

Mutation, forms entirely new alleles, the other answer choices change preexisting allele distribution within the population.

mutation should be the answer

what are the awnser choices? i mean, without choices, it is an incompleat

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.