Many individuals think that nowadays, research done with animals is harmful and it should be prevented. In fact, other people said that it is pivotal in terms of getting new findings that can be beneficial for science. This essay will elaborate about how the idea of experiments conducted on animals is justified and gives other recomendation towards this motion. It is believed that despite being a controversy, animals experimentation can be justified regarding the advantages of this activitity. Having an experiment to find particular case related to animals sometimes can not be done without the involvement of using the real parts of the animals body. For example, the recent research conducted with a pig heart transplanted to human body to find an alternative transplant requires the animal organ. This research therefore is advantageous to give a solution for human disease related to transplantation. However, the existence of technology can faster the human job in doing science relate...