The history of world agriculture is characterized by long periods of no change interrupted with short periods of major change
Indicate whether this statement is true or false
FALSE
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Almost half of the world's people speak languages belonging to the ____________ language family.
a. Indo European b. Sino-Tibetan c. Austronesian d. Trans-New Guinea e. Afro-Asiatic-Indo-European
When mechanical work is done on a system, there can be an increase in its
A) thermal energy. B) temperature. C) both A and B D) neither A nor B
The number of people who are too young or too old to work compared to the number of people in their productive years is called the
A) social dependence rate. B) productive capacity ratio. C) elderly support ratio. D) infant mortality rate. E) dependency ratio.
Studies conducted since the 1970s reveal that most tornadoes have winds of less than ____________________ knots
Fill in the blank with correct word.