MICROANATOMY

Detailed explanation-1: -Destruction of a human embryo is required in order to research new embryonic cell lines. Much of the debate surrounding human embryonic stem cells, therefore, concern ethical and legal quandaries around the destruction of an embryo.

Detailed explanation-2: -Of the different types of stem cells, embryonic stem cells are the most controversial because their research consists primarily of experimentation on cells that have the potential to become a developed human.

Detailed explanation-3: -Why is the use of embryonic stem cells controversial? Due to the fact that they are derived from human embryos a lot of people believe that the use of the embryo for either research or treatment would result to killing a human life.