stem cells can be found in the __________ __________ of adult humans. what two words complete the sentence?

The two words that complete the sentence "Stem cells can be found in the ________ ________ of adult humans" are "bone marrow." Stem cells in adult humans are commonly found in the bone marrow, which is a primary site for hematopoietic stem cells responsible for producing blood cells. These stem cells also exist in other tissues, but bone marrow is the main recognized source in adults.