Question

1 . define diffusion
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Answer 1

Answer:

Diffusion is the movement of a substance from an area of high concentration to an area of low concentration. Diffusion happens in liquids and gases because their particles move randomly from place to place. Diffusion is an important process for living things; it is how substances move in and out of cells.

Answer 2

Answer:

diffusion is a process by which unicellular organisms can respiration.

Step-by-step explanation:

because it is a very slow process,in a single cell the respirations is done easily