Which of the following pioneers was not making a professional impact during the scientific management era?

If you mean how the great lakes formed, then  the great lakes began to form at the end of the last glacial period 14,000 years  ago, ice sheets  retreated, which led to exposing the basins they had carved into land which then filled with melt-water.

Ithink that it’s b

Answer acetylcholine deficiency;