Why did the improvement of microscopy techniques in the late 1800s set the stage for the emergence of modern genetics?

president thomas jefferson commissioned the expedition shortly after the louisiana purchase in 1803 to explore and to map the newly acquired territory, to find a practical route across the western half of the continent, and to establish an american presence in this territory before britain and other european powers

answer; i believe the answer is (mesopotamia); modern day

new evidence is discovered.

oversights and errors are corrected,

new technology is applied to evidence.