Which of the following is the best description of an adaptation?
a.
a trait that was beneficial to survival in the past
b.
a trait that is of no advantage to survival
c.
a trait that will be beneficial in the future
d.
an environmental change that selects for certain traits
e.
a trait that is currently beneficial to survival

answer; i believe the correct answer is ( proteins );

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.