Why is diffusion insufficient to meet the oxygen requirements of multicellular organisms like humans?
The size of the multicellular organisms is very large compare to unicellular organisms. Diffusion is a passive mode of transport of substances and can transfer gases up to a very small distance only. This will not be sufficient for multicellular organisms’ needs. 2. What criteria do we use to decide whether something is alive? Answer: The main criteria to check for life, is the sign of breathing and respiration. If there is no sign of breathing or respirations then the given organism is not alive. 3. What are outside raw materials used for by an organism? Answer: Minerals and water and gases are outside raw materials used by an organism. 4. What processes would you consider essential for maintaining life? Answer: Processes essential for maintaining life are as follows: Nutrition Respiration Reproduction Excretion Locomotion or movement 5. What are the differences between autotrophic nutrition and heterotrophic nutrition? Answer: Autotrophic nutrition means that the organism is preparin
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