Question

question 5
what is a cause and effect relationship that takes place in the article?
a. because the u.s. bought alaska at a bargain price, seward was able to gain over 70 territories.
b. because the u.s. needed a safe place for military aircraft to land, each island was protected.
c. because guano added up and mounds could reach 150 feet, the u.s. returned some islands.
d. because chemical fertilizers were invented, guano fever died down after only a few years.
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Explanation:

Guano was highly - prized as a fertilizer. When chemical fertilizers were invented, the demand for guano decreased, causing "guano fever" to subside. The other options have incorrect cause - effect relationships. The U.S. buying Alaska didn't lead to Seward gaining over 70 territories. The need for military aircraft landing places isn't related to island protection in the way stated, and the height of guano mounds isn't related to the U.S. returning islands.

Answer:

D. Because chemical fertilizers were invented, guano fever died down after only a few years.