Is a technique that involves putting a healthy copy of a gene into cells that have a defective copy of the same gene. a) gene therapy b) binary fission c) tumor necrosis d) dna fingerprinting

gene therapy

Explanation:

Gene therapy is the introduction of DNA into cells of an individual to correct a mutant phenotype. Gene therapy can be used to compensate for loss-of-function mutation ,suppression of dominant mutation  and therapeutic protein product. In recent times, gene therapy has been applied in therapeutic angiogenesis for heart disease - to increase blood flow  and expression of gene encoding protein that is harmful to cancer cells.

i'd say that the moon rock is about 2.2 billion years old.