According to the pressure-flow hypothesis, what mechanism causes the movement of phloem sap from sources to sink tissues? see section 35.4 (page) .
a) transpirational pull from the leaves
b) solute potential differences between source and sink
c) root pressure
d) pressure potential differences between source and sink

Could someone me with number one you

Johnny rode his bike to a friend's house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was not able to play. what was his displacement for the total bike ride? how did you determine this? what could we use as a reference point to determine he was in motion during his bike ride? why can you use it as a reference point

Which nucleotide component contains nitrogen