How does osmotic pressure affect plants structure? A. osmotic pressure prevents plants from losing water
B. osmotic pressure allows plants to receive more sunlight during the day
C. the more water stored in the vacole the more structural support plants receive
D. water in the vacole prevents plants from being eaten by animals ​

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The most plausible answer is b, duration. the given amount of time is considered how long it last for.

The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .