How did new scientific knowledge help the building of the Panama Canal? A. Fewer workers got sick from malaria and yellow fever.
B. Radios helped workers stay in touch with their families.
C. Better nutrition led to more work being done by laborers.
D. Airplanes were able to deliver supplies more quickly.

The correct answer is A!!

Explanation:

Fewer workers got sick from malaria and yellow fever.A canal in Central America would make it easier to reach the Pacific Ocean from the eastern coast of the United States.New scientific knowledge help the building of the Panama canal because there was a decrease of workers getting sick of malaria and yellow fever. It was Colonel Gorgas, the Chief Medical Officer, who have read about discoveries linking mosquitoes and malaria. Due to these readings, he succeed in eradicating the cause of the disease therefore a decrease in people getting sick.

Hope this helps!!

b) the confederacy had to pay all union war expenses.

i just answered it

explanation: