What is gene therapy?

Gene therapy involves altering the genes inside your body's cells in an effort to treat or stop disease. Genes contain your DNA the code that controls much of your body's form and function from making you grow taller to regulating your body systems.

gene therapy is a medical field which focuses on the genetic modification of cells to produce a therapeutic effect or the treatment of disease by repairing or reconstructing defective genetic material.

explanation:

the fossil record extends back to a dog-like ancestor some 55 million years ago, which gave rise to the first horse-like species 55 to 42 million years ago in the genus eohippus.

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."