Scientists have used animals as their subjects to experiment on for their researches for centuries. Some hold the opinion that such trials should be completely banned as they put animals in discomfort, and sometimes in danger as well, whereas another group of thinkers believe that such experimentations are important for crucial discoveries. Importance of such researches cannot be denined, however, the advancement in technology have provided several alternatives. Firstly, animals, due to their anatomy and similar immune systems to humans, have always been used for drugs trials during various stages of the drug discovery processes. In other words, researchers conduct experiments, take observations of medicines' impact, make modifications and reconduct the trials. Unless a treatment's efficacy is proven on animals, it is not deemed to be fit for further trials on human beings. For instance, in the case of current pandemic, Covid-19, reasearchers are conducting vaccines trials o...