How can you define diffusion?

Diffusion is the movement of molecules from a region of higher concentration to a region of lower concentration down the concentration gradient.

Explanation:

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Diffusion is the movement of particles from one area of greater concentration, to another area of lower concentration, driven by thermal energy.

Explanation:

Yes.

Explanation:

Yes, the goal of meeting economic and human needs is improved of life because people work hard in order to make themselves economically stable and fulfil their basic needs. When a person fulfill their basic needs, they go further to improve his lifestyle. So we can conclude that the main goal of fulfilling economic and human basic needs is to better the life of an individual.