Which phrase best describes the time period in which the current body of scientific knowledge was developed?

a. just over the last 50 years
b. throughout all of history
c. mostly during roman times
d. mostly in the 20th century

The correct answer is throughout all of history.

The scientific knowledge was used to know the information from the days when the life on earth started or we can say that we have the knowledge of the time when the earth was formed. We have all the knowledge, factual information and description of all the event throughout all of the history.

that is wrong, its not thymus.