Question

plx answer me plx tomorrow is my paper

Answer 1

1. by xylem and phloem.
2. mixing of two substance.

Answer 2

defussion  = Diffusion is the net movement of molecules or atoms from a region of high concentration (or high chemical potential) to a region of low concentration (or low chemical potential) as a result of random motion of the molecules or atoms. Diffusion is driven by a gradient in chemical potential of the diffusing species.