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?​

Answer 1

Answer:

Human beings are multicellular organisms having a complex body structure. The oxygen requirement in multicellular organisms cannot be met by diffusion because-

1) Diffusion is a slow process.

2) In multicellular organisms, the cells are not in direct contact with the outside environment as in unicellular organisms.

Therefore, in human beings, there are specialized tissues and organs that help to meet the oxygen requirements of the body.

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Answer 2

What criteria do we use to decide whether something is alive?

Walking, breathing, growth and other visible changes can be used to determine whether something is alive or dead. However some living things will have changes that are not visible to our eye; Hence, presence of life process is a fundamental criteria to decide whether something is alive.