Question

Why is diffusion insufficient to meet the oxygen requirements of multi-
cellular organisms like humans?
What criteria do we use to decide whether something is alive?
What are outside raw materials used for by an organism?
What processes would you consider essential for maintaining life?​

Answer 1

Answer:

Unlike unicellular organisms, multicellular cells are not in direct contact with the outside environment. Therefore, diffusion simply cannot meet their oxygen requirements. Any visible movement such as walking, breathing, or growing is generally used to decide whether something is alive or not

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Answer 2

Answer:

Ans 1. Diffusion is unable to meet the oxygen requirements of multi-cellular organisms such as humans because diffusion is one of the slow processes. That is a lot of time is required for oxygen to circulate to all the cells of the body. ... Therefore, through diffusion, it becomes difficult for oxygen to reach all the cells.

Ans 2. The most important criteria do we should use is movement.

Ans 3. Raw material from outside are:

Plants as food, Water and Oxygen.

Ans 4. Essential processes for maintaining life are respiration, nutrition, digestion, excretion, reproduction and metabolism.