Water flows into the phloem by the leaves because...
a) sucrose solution in the xylem is hypotonic compared to the water in phloem
b) sucrose solution in the xylem is hypertonic compared to the water in phloem
c) sucrose solution in the phloem is hypertonic compared to the water in xylem
d) the sucrose solution and water is isotonic
e) sucrose solution in the phloem is hypotonic compared to the water in xylem

imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.

other quantities, called derived quantities, are defined in terms of the seven base quantities via a system of quantity equations. the si derived unitsfor these derived quantities are obtained from these equations and the seven si base units.