I agree on the animal experiment .

For example, Do you know sulfanilamide situation? Without going through animal experiments, 107 people died because of a side effect of the medicine

If animal tests conducted, Maybe 107 people could not die.

In Morgan genetic experiment, the study shows sex-linkage such as Color blindness, hemophilia in a short time, and Animals are used in the study of psychology For instance Pavlov's dogs test show fundamental principles of psychology.

Animals feel pain, fear of death, like humans Animal experiment can’t show us every harmful disease in human, Research that animal experiment can not be avoided is okay when Principles of animal experiment(3R Principles) is obeyed.

*3R Principle

1- Reduction : use a small number of animals as much as possible

2- Replacement : prior to the beginning of experiment, try to seek alternative

3- Refinement : while experiments are conducting, Animal experiment must be conducted in this way that animals don't feel as possible as pain and welfare of animals is improved .