If we found a way to repair a single cell with the DMD gene in a 2-year old child, could we cure DMD by repairing that single cell?

No

Explanation:

because every cell will have that gene and you can't change a gene that was inherited from your parents.

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.

answer; ///(b) it is composed of four protein chains and four heme groups;