The high sugar concentration inside phloem causes water to move into it. This process, which requires no energy from the plant, is called .

The correct answer is osmosis

Explanation:

Osmosis is a process through which water moves from an area which is having a low concentration of solute to an area that is having a high solute concentration through a semi-permeable membrane.  

As the water or liquid moves down its concentration gradient so energy is not required in this movement. So the high sugar concentration in the phloem causes water to move inside it along the concentration gradient without energy is called osmosis. Osmosis is a form of diffusion.

that is wrong, its not thymus.

some scientists like gregory adcock agree with thorne's theory of regional continuity.

others, like chris stringer and ian tattersall, believe thorne's results may be contaminated or misinterpreted.