Ascientist wants to test how much of an acid can be added to a solution before
the ph of the solution changes to below a certain point. the starting ph of the
solution is 6.0, and the scientist wants to know when the ph of the solution
changes to below 4.0.
which ph indicator should the scientist use?
a
cresol red, which changes from yellow to purple around a ph of 7.2
b. thymolphthalein, which changes from colorless to blue around a ph of
9.3
c. methyl yellow, which changes from yellow to red around a ph of 4.0
d. methyl violet, which changes from violet to yellow around a ph of 2.0

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

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above statement is not a true statement about the open ocean because the open ocean has low levels of nutrients. most of the photosynthetic activity on earth occurs in the open ocean within the photic zone. organisms in the deep ocean are exposed to frigid temperatures and total darkness but it does not begin at the low-tide mark.