A grain of sand is about 10-3m in diameter.  A human hair is about 0.1mm in diameter.  A red blood cell is about 10 uM in diameter.  A macrophage is about 10-7km in diameter.  A coronavirus is about 100nm in diameter.   Which two in the list above have approximately the same diameter? The options are  grain of sand, human hair red blood cell, macrophage all are different diameters red blood cell, coronavirus human hair, macrophage

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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.