Genetic therapy and engineering
a.
have no value for our future
b.
have been used for many years to prevent genetic diseases
c.
are simple procedures that most doctors can perform
d.
are controversial scientific procedures

D. are controversial scientific procedures

Explanation:

As the name suggests, both therapy and genetic engineering refer to genetics, that is, genes and DNA molecules, responsible for our biological inheritance. There are thousands of genes in our cells and each has a code capable of activating a specific function of the body. What researchers working with engineering and gene therapy have tried to do is to reprogram this genetic information so that the cell's instruction is, for example, to attack cancer.

These two strands are extremely controversial, because they deal with a very delicate and powerful molecule, DNA. Many find it dangerous to interfere with the way our DNA works, while others believe that for religious reasons it is not correct to tamper with the human body at the cellular and molecular level.

since you have not provided the options here i   am going to give you general overview about hormone.hormone are actually the part of endocrine system in our body and produced by the endocrine glands. the hormones act like a chemical messenger   within human body. once produce by the glands they   travel through the blood stream and reach at specific or target tissue and organs   which result in control of our body function. the hormones are specific in their work and work on only the targeted tissue or organ   . with the of hormone endocrine system regulate the heart rate , metabolism, our mood and   growth as well as the development and even the sleeping cycle etc. they actually are the messenger for body cell and organs .