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Median Age In 2005 Japan had the highest median age of all countries in the world, while Australia's population was only moderately aged. Some 50 years ago the demographic situation…

Cellulose Digestion Human lack the enzyme necessary to digest cellulose. Hay and grasses are particularly abundant in cellulose, and both are indigestible by human (although humans can digest starch).... Read…

San Community San, people of southern Africa, consisting of several groups and numbering over 85,000 in all. They are generally short in stature; their skin is yellowish brown in color,…

Physical Exercise Regular physical exercise is one of the most beneficial things that people can do to protect their health. Moving more and sitting less has enormous benefits for all,…

Vaccination Most parents prefer to have their children vaccinated according to the recommended schedule. But some parents can still have concerns about vaccination, and it may be tough to get…

Hardwood Forest All of their predominant trees with the neighbouring plant communities, and no common animal or plant is restricted to cover forest. The key to its recognition is variety,…

Transportation Transport accounts for about a quarter of greenhouse-gas emissions, and road transport makes up more than 70% of that amount. Ethanol is a clean, high-performance renewable fuel that works…

Water and Sustainable Development Read the passage below and summarize it using one sentence. Type your response in the box at the bottom of the screen. Your response will be…