What type of stem cells are referred to as adult stem cells?

Adult stem cells refer specifically to stem cells that are derived from the tissues of an adult organism. These cells are multipotent, meaning they have the ability to differentiate into a limited range of cell types related to the tissue from which they originate. For example, hematopoietic stem cells found in bone marrow are capable of developing into various blood cell types.

This answer is correct because it accurately describes the origin and characteristics of adult stem cells, distinguishing them from embryonic stem cells, which are derived from embryos and have the potential to differentiate into any cell type. The other options misrepresent the source or function of stem cells, such as suggesting that adult stem cells are found only in plants or that they cannot differentiate at all. In fact, adult stem cells play a crucial role in tissue maintenance and repair throughout an organism's life.