To determine which type of model best illustrates the formation of blood cells, let's examine the options:
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Dissected fetal pig - This provides a real-life demonstration of an organism's anatomy and physiology, including the bone marrow where blood cells are formed. The fetal pig anatomy closely resembles that of humans, making this a strong candidate.
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Computer-generated model - This can provide detailed and accurate representations of biological processes, including hematopoiesis (the formation of blood cells). However, without context or detail about the specific model, it may not be as tangible as a real specimen.
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Plastic bone - This is often used for educational purposes to show bone structure but does not provide information about blood cell formation, which occurs in the bone marrow.
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Photograph of a bone - This might show bone structures but lacks the interactive or detailed understanding of the blood cell formation process.
Considering all options, the dissected fetal pig is the best illustration of the formation of blood cells, as it provides a visual and physical representation of the actual biological processes involved in hematopoiesis.