To determine which type of model best illustrates the formation of blood cells, let's consider each option:
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Plastic Bone: This is a physical representation of bone structure but does not provide insight into the process of blood cell formation.
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Photograph of a Bone: A photograph would show what bones look like, yet it wouldn't illustrate the process of hematopoiesis (blood cell formation).
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Computer-Generated Model: This type of model can simulate biological processes and functions, making it a strong candidate for illustrating the formation of blood cells as it can visually depict the cellular processes in a dynamic manner.
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Dissected Pig: While a dissected pig can provide a real-life example of anatomy, it may not effectively demonstrate the specific process of blood cell formation specifically.
Given these considerations, computer-generated model is the best choice as it can effectively illustrate and simulate the formation of blood cells.