Can a theory be revised and replaced

Embryonic stem cells are cells derived from an embryo. these cells can be used to create new tissues for patients suffering from certain illnesses and disorders. which statement best summarizes why the use of embryonic stem cells could be seen as unethical?

Mrna decodes information from the original dna master plan to build proteins in the during the process of ribosomes.

What materials must dams have to produce electricity, and what must occur?