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a line that divides Earth into the parts that are experiencing daylight and the parts that are...
the movement of goods and services and income and expenditure in the economy.
a model of the economy with its flows of goods and money.
an organ system that passes nutrients, gases, hormones, blood cells, etc. to and from cells in...
the replacement of liver tissue by scar tissue due to damage to liver cells caused by excessive...
a thin uniform layer or sheet of hazy cloud that forms high in the atmosphere
the role of all citizens to respect the environment within which they live and to treat others...
biological classification group (taxon) that is divided into orders.