Stalactites and stalagmites are two coneshaped mineral formations that form in caves. stalactites hang down from the ceiling and stalagmites rise up from the cave floor. what causes cave minerals to form in this way?
existing minerals change into new minerals when nearby molten rock causes an increase in temperature.
molten rock cools and hardens as it reaches earth's surface.
groundwater carrying dissolved materials combines with surface water and causes minerals to precipitate out of solution.
groundwater heated by molten rock reacts with minerals in the rock to form new minerals.

the answer is z.

the human body has five levels of organization. level 1: cells. cells are the basic units of life and form the first level of organization. cells in the human body have specific functions. examples include nerve cells, blood cells, liver cells, and so on.

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.