Question

to transport waste away from cells to this excretory tissue
s consider these various processes, so essential to maintain
by one.
QUESTIONS
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?
Wat processes would you consider essential for maintaining life?
UTRITION
ewalk or ride a bicycle, we are using up energy. Even when we
doing any apparent activity. energy is needed to maintain a​

Answer 1

Answer:

I think..

Explanation:

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.