Because bacteria can be attached to almost anything due to its chemical properties
Answer:
(2) diffusion
Explanation:
Diffusion is a process in which molecules moves from a region of higher concentration to the region of lower concentration. In this condition, plant roots contain high concentration of nitrates than soil so nitrates moves from roots through semi-permeable to the soil by the action of diffusion until the concentration is uniform or equilibrium.
<span>a bird flying from a tree</span>
It adds bases in only one direction.
