Scientific ocean exploration began in the 19th century, using wooden sailing ships. At that time, explorers had none of the technological sophistication and tools available today. A comparison of modern-day exploration with the late 19-century journey of the HMS Challenger<span>illustrates the progress that science has made in ocean exploration.</span>
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For these nations, population growth will be a serious problem if food and other resources are not adequately distributed. Demographers use their knowledge of fertility, mortality, and migration trends to make projections about population growth and decline several decades into the future.
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