Answer: 1, 3, & 4
creating rest-resistant strains of vegetables
the use of tissue and organ transplants
the use of laser technologies to avoid open-heart surgery
Explanation:
It was freedom, philosophers argued, that had at Marathon been defended by the Athenians. Because their victory had inspired other Greeks to resist Xerxes, Marathon had been an important battle: in Marathon, the foundations of western civilization had been laid.
The Battle of Marathon was significantbecause it proved to the Greeks that the Persians were not 'invincible', which boosted the moral of the Greek troops, increasing their confidence to incline themselves in a common cause if the Persian attacked again (which they would).
The Kingdom of Saudi Arabia covers the greater part of the Peninsula. The majority of the population of the Peninsula live in Saudi Arabia and Yemen. The Peninsula contains the world's largest reserves of oil.
Answer: C. Massive investments in equipment were necessary to make mining profitable
Explanation:
After the California Gold Rush of 1829, more and more deposits were discovered in the west of different resources and precious minerals such as gold in Colorado and silver in Nevada.
The prospect of making money from mining was so attractive that thousands of Americans traveled west in the hope of getting rich. Upon getting there however, the prospective miners would quickly discover that mining was no easy task as in the case of gold which was hidden deep in quartz that was underground and so would require massive investment in equipment to get to it.
For this reason, companies came to dominate the mining scene because individuals could rarely afford such expensive machinery.
