The scientific method after it was developed by Francis Bacon can be used to almost all fields of study.

According to The National Academics of Sciences Engineering Medicine, the use of scientific method in researches generate satisfactory form of evidence to support theoretical claims and integrity in the investigation process. One modern revolutionis who has performed scientific methods and has great contribution in the field of science, especially in microbiology was Van Leeuwenhoek. He built a microscope and was able to observe microorganisms. With that, he established the idea that there were forms of life called microorganisms The scientific method was emphasized with him experimenting to gathern empirical data which are the number of microorganisms in specimens Moreover, series of investigations were conducted and animal replicates were used, thus, his conclusions became the foundations of the sciences of bacteriology and protozoology of today (Encyclopedia Britannica,

2020). Also, his microscopical investigations of the spermatozoids is one of these researches which has been of essential importance for our present knowledge of human propagation (Houtzager,1983).