Maintaining biodiversity is very important since most natural areas, like the rainforest, are places to get medicines. If not maintained, a lot of people will not be provided with the proper treatment and will suffer from various diseases. In the present, science and medicine has discovered a fraction of some species for medicine and in the future, there might be more possibilities for discoveries to occur and lead a revolutionary change in the filed of medicine.
Many people believe it to be unethical to remove/implant an embryo into a female, just as they see it unfitting to manipulate an individual when in an embryonic state.