A. Charles Darwin
Darwin suggested that a sneer retains elements of baring one's teeth so as to threaten predators.
Answer: While building the city Tenochtitlan on the islands of lake Texcoco, the Aztecs faced swampy lands with no foundations and soil that was bad for farming.
Explanation: Because the islands in lake texcoco did not have very solid ground, the Aztecs had trouble building their city. They overcame these challenges by building canals to reroute the water.
Answer:
NAFTA, the largest free-trade agreement in the world, came into force during the Bill Clinton´s years (1993). It created a free-trade zone comprising Mexico, the United States and Canada. It has boosted trade, investment, prosperity and economic interconnection of the three parts. Although it has been modified by an initiative of the current Donald Trump´s administration, free trade exchanges will continue. The Clinton years were important for free trade around the world. The Senate approved the GATT treaty. Other countries and regions followed and reached free-trade agreements after NAFTA.
Explanation:
Option B, Spain arrested several Cubans it was believed to have caused the blast was true about the sinking of the USS Maine.
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Originally, the ship's disappearance, the USS Maine, prompted Spain to consider it blown up in a bay, near Havana. Yellow journalism was a trend that encouraged newspapers to sympathize with or encourage the cause of the Spanish revolution.
Nevertheless, the truth was that the engine of the ship was not functioning properly. This was discussed years after the fire in 1898.
The burning of the ship actually caused some people to want to have the USA to declare war on Spain as they killed the Americans on ship. Nonetheless, Spain didn't actually destroy the ship because of the incorrect information. The USA used the blast to wage war on Spain, and the Spanish-American War was won in 1898. It was the blast.