Most of the oxygen in the Earth's atmosphere was produced through ____________________
Fill in the blank(s) with correct word
photosynthesis
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Which statement is not true in the United States?
A) Nearly twice as many Americans migrate from cities to suburbs each year as migrate from suburbs to cities. B) Suburban schools tend to be more modern and safer. C) Net migration from urban to rural areas is called couterurbanization. D) The major reason for the large-scale migration to the suburbs is because of employment. E) Intraregional migration has been primarily from cities to suburbs.
Britain forced China to purchase opium during the first half of the 1800s in order to help Arab merchants
Indicate whether the statement is true or false
Thermometers are designed to measure ___________________ and are not placed in direct sunlight, whereas our bodies, on the other hand, are influenced by both air temperature and direct sunlight. Therefore, we usually feel ____________________ on a cold, calm, sunny day than a thermometer indicates
Fill in the blank with correct word.
The Caucasus region, bordered by the Black Sea and Caspian Sea, lies to the southwest of Russia
a. True b. False Indicate whether the statement is true or false