Which individual from this era contributed the most to these developments?

Instructions
We have now explored the Scientific Revolution, the Enlightenment, and science in the 19th century. Which era was the most significant in terms of scientific and intellectual achievement and why? Which individual from this era contributed the most to these developments? A primary source is required for this assignment that was written by this person. How does using the primary source help you better understand him or her? Here are example links for primary source collections online: The Scientific Revolution, the Enlightenment, and 19th Century (and other) primary sources.
Paper Outline (Use Subheadings for Parts A, B, and C):
Title Page
Part A: Era Selection Answer
Part B: Individual Selection Answer
Part C: Primary Source Answer
Bibliography
Length: 250 to 500 words (not including title page or bibliography).
Format: APA, MLA, or Chicago Manual of Style.
Paper Requirements:
Cite the readings for the week, indicating how they informed your answer.
Cite ONE primary source written by your selected person for the week. As a reminder, a primary source “is a document or physical object which was written or created during the time under study. These sources were present during an experience or time period and offer an inside view of a particular event.”
Include a bibliography.
Readings for the week: Science and Technology in World History: Chapter 16. Life Itself, Michael Ruse, Charles Darwin