What did griffith observe when he injected a mixture of heat-killed, disease-causing bacteria and live harmless bacteria into mice? a. the disease-causing bacteria changed into harmless bacteria. b. the mice developed pneumonia. c. the harmless bacteria died. d. the mice were unaffected.

correct answer is B.

bcz genetic information is transferred to others and mouse get pneumonia.

Hope it helps. if you need more info ask.

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.