Question

1.
Why is diffusion insufficient to meet the oxygen requirements of multi-
cellular organisms like humans?
2.
What criteria do we use to decide whether something is alive?
3.
What are outside raw materials used for by an organism?
4.
What processes would you consider essential for maintaining life?
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Answer 1

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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. Besides, in humans oxygen requirement is more at cellular and tissue level.

2, Any visible movement such as walking, breathing, or growing is generally used to decide whether something is alive or not. However, a living organism can also have movements, which are not visible to the naked eye.

3, Food as source of energy. c. Water for proper digestion of food and other functions inside the body. The raw materials required by an organism will vary depending on the complexity of the organism and its environment.

4, In humans and other vertebrates, there are certain processes which are considered critical for sustaining life. These include respiration, nutrition, digestion, excretion, reproduction and metabolism.

$\pink{Thank\:you...}$

Answer 2

Answer:

Explanation:

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. Besides, in humans oxygen requirement is more at cellular and tissue level

2.Any visible movement such as walking, breathing, or growing is generally used to decide whether something is alive or not. However, a living organism can also have movements, which are not visible to the naked eye.

3.Food as source of energy. c. Water for proper digestion of food and other functions inside the body. The raw materials required by an organism will vary depending on the complexity of the organism and its environment.

4.In humans and other vertebrates, there are certain processes which are considered critical for sustaining life. These include respiration, nutrition, digestion, excretion, reproduction and metabolism.