1. Why is diffusion insufficient to meet the oxygen requirements of multicellular organisms like humans? - ANSWER= As in multicellular organisms, all the cells are not in direct contact with environment, simple diffusion does not meet the requirement of all the body cells to get sufficient oxygen. the following reasons: 1. Large Body Size and Complexity 2. Greater Oxygen Demand 3. Larger Distance Between Cells and Environment 4. Need for Rapid Transport System Conclusion : Thus, simple diffusion is adequate only for small and simple organisms. For complex, multicellular organisms like humans, specialized organ systems are necessary to fulfill the high oxygen demands efficiently Check Answer 2. What Criteria Do We Use to Decide Whether Something is Alive? - ANSWER= To determine whether something is alive, scientists and biologists look for certain characteristic features that all living organisms share. These incl...
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