Four important discoveries are listed below: 1. Some animals can regrow their limbs.
2. All plant and animal tissues are made up of cells.
3. Dominant and recessive traits are passed from parents to offspring.
4. Chromosomes replicate during cell division.
What two discoveries required the use of the microscope?
A 1 and 2
B 2 and 4
C 1 and 3
D 3 and 4

segmentation=endoskeleton=backbone=coelom=tissues

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.