What is an example of a physical system

American troops were worried about cantracting in cuba a. yellow fever b. hepatitis c. polio

The battle of sabine pass is important because? a) it was a stalemate between union and confederate armies. b) it resulted in the largest confederate casualty in the war. c) it marks the failed attempt of the union army to invade the confederate state of texas. d) it was won by the union soldiers and marked a turning point in the western front of the war.

Which combination would the president most likely use to convince congress to pass an economic stimulus bill?