Embryonic stem cells are undifferentiated cells. They can grow and divide giving rise to any type of tissue in a developing embryo. What must be true of the DNA in an organism's stem cells?

Stem cells cut and repair their own DNA to promote formation of new tissues.

Explanation:

Stem cells cut itself and then repair their own DNA as a mechanism of activating genes that promote the development of new tissues. Stem cells are special type of cells that the ability to develop into many different types of cell such as muscle cells, brain cells etc. These cells are also capable to repair damaged tissues in the body.

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds

c should be the answer