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Two-part question about animals: 1a. Why do smaller animals typically have a simple respiratory system, while larger...

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Biology

Two-part question about animals:

1a. Why do smaller animals typically have a simple respiratorysystem, while larger animals require more complex respiratorystructures like gills or lungs?

1b. Many immune system functions in animals are completed byindividual cells that can travel throughout the body, instead ofremaining stationary within specialized organs. Why is thisimportant for the immune system to function well?

Answer & Explanation Solved by verified expert
3.6 Ratings (280 Votes)
Ans 1a The complexity of respiratory system is correlated with size of organism As animal size increase diffusion distances increase and ratio of surface area to volume drops In unicellular organisms diffusion across cell membrane is sufficient for supplying oxygen to the cell Diffusion is slow passive transport If the cells are very large or    See Answer
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