Gregor mendel was the first scientist to use statistics to analyze scientific data. before mendel's experiments, scientists
believed that organisms acquired traits from their environment and passed them on to their offspring. after mendel's
discoveries were accepted, scientists realized that traits passed to offspring were the result of genes being passed from
parents to offspring. this is an example of
a theory changing because a new scientific method was developed.
a law changing because a new scientific method was developed
a hypothesis changing because a new scientific method was developed
an observation changing because a new scientific method was developed.

69 is the correct math for the amino acids

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.