Which adds evidence to the idea that the cell is the basic unit of life?
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a. it is impossible for a multicellular organism to survive.
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b. small organisms are generated spontaneously.
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c. each cell contains ribosomes and has a cell membrane.
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d. many organisms in the world are made of only one cell.

plato users:

d.  

there was a variety of food available on island x, but there were only large seeds and nuts on island y.

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.