What is charles darwin's major contribution to science? a. he categorized thousands of species to compare their different traits. b. he explained how species evolve. c. he showed dna is passed from parents to offspring. d. he performed an experiment showing how molecular compounds first formed.

this protocol provides a detailed procedure for agarose-based ip to purify and enrich the protein of interest.

i am positive it is c. condensing but i may be wrong

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.