Evaluate the use of stem cells from embryos or from adult bone marrow for treating human diseases .

Stem cells are cells that are having the ability of self-renewal and can divide into other types of cells in order to produce more of the stem cells.

Stem cells from embryos are called embryonic stem cells, which are removed from the inner cell mass of blastocysts in the embryonic development stage and can also extracted from adult bone marrow in order to treat disease. Several ways to use stem cell for  treating human diseases are as following:

1) evaluation of how diseases and conditions develop by watching development of stem cells in bones and muscles.

2) Stem cells are having the potential to grow into new tissue and used in transplant and regenerative medicine in several disease such as spinal cord injuries, type 1 diabetes and Parkinson's disease.

3) New drugs can be tested on stem cells at labs.

4) adult bone marrow stem cells are able to create bone or heart muscle cells.

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explanation:

halogen, any of the six nonmetallic elements that constitute group 17 (group viia) of the periodic table. the halogen elements are fluorine (f), chlorine (cl), bromine (br), iodine (i), astatine (at), and tennessine (ts).