Answer:
Moves down the concentration gradient
Explanation:
Since diffusion moves materials from an area of higher concentration to an area of lower concentration, it is described as moving solutes "down the concentration gradient" (compared with active transport, which often moves material from area of low concentration to area of higher concentration...
Well he used both. But true is the answer
A tumor that invades surrounding tissues, is usually capable of producing metastases, may recur after attempted removal, and is likely to cause death unless adequately treated.
Proton is positive.(+)
Neutron is neutral(0)
Electron is negative(-)
