The first European to sail the new all water rout around Africa to the orient was

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

How are the perspectives presented in the excerpts similar? they show the disappointment and fear mission control workers feel when the lunar module develops problems. they show the huge investment of time and energy mission control workers dedicated to the lunar module. they show how mission control workers view the lunar module as if it is the workers' very own child. they show the relief and excitement mission control workers feel when the lunar module lands on the moon.

Which of the following was probably the most difficult challenge facing construction of the railroad?