To determine which model best illustrates the formation of blood cells, it's important to consider what each option represents in terms of biological context.
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Dissected pig - While it provides a real biological context and could show how blood cells are produced in a living organism, it may not specifically highlight the cellular development process.
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Photograph of a bone - This can show the structure of bones but doesn't illustrate the bone marrow, where blood cells are formed. It lacks depth in understanding blood cell formation.
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Plastic bone - Similar to the photograph of a bone, this model serves to illustrate bone structure but does not convey the biological processes involved in blood cell formation.
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Computer-generated model - This type of model can depict intricate biological processes and allow for dynamic representations, such as the formation and differentiation of blood cells from stem cells in the bone marrow.
Given these considerations, the computer-generated model best illustrates the formation of blood cells, as it can effectively demonstrate the complex process of hematopoiesis (the formation of blood cellular components) in an interactive and explanatory manner.