In histopathology, why do different stains have different affinities for different organisms or different parts of organisms? Explain and include the Hematoxylin and Eosin staining as an example to further understand. Please answer the question concisely and don't just simply give the meaning of Hematoxylin and Eosin staining.

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Hematology

Hematology is the branch of biology. Hematology is the medical field that deals with the treatment of blood disorders and cancers, such as hemophilia, leukemia, lymphoma, and sickle-cell anemia. Hematologists and hematopathologists are medical professionals who specialize in illnesses of the blood and its components.