Answer: A monk called Dionysius Exiguous calculated his own present year to be A.D. 525. Counting from that year reaches the current year. A.D. is now used to label the number of years in the Gregorian calendar, the most widely used calendar in the world and the unofficial global standard. You add one year every January 1.
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A. Rural to urban migration increases the population density to eastern China
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the green plants have a structure called the Chlorophyll the Chlorophyll traps sunlight and the leaves and abosrbs the sunlight and minerals present in the soil and they use the minerals and sunlight to prepare food for the rest of the plant the stem transports all the food and gives it to the rest of the plant
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this is how i learned it
The type of relationship they share is a flexible relationship cause they both have or share the same job