Question

Q U E S T I O N S
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 if you know bit don't write anything silly.​

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.