What event in history do we use to mark year 1 on the calendar? A: The date in which humans began recording time. B: The beginning of the first known civilization. C: The approximate year of the first human beings. D: The approximate date of the birth of Jesus Christ.

D.

Explanation:

The calendar is divided into two eras-- BC (Before Christ) and AD (Anno Domini). Anno Domini  is the term derived from Latin which means 'in the yeaar of our Lord.' The calendar is recognised based on the birth of Jesus Christ of Nazareth.

Thus AD 1 or year 1 on the calendar marks the approximate date of the birth of Jesus Christ. Therefore, the correct option is D.

D: The approximate date of the birth of Jesus Christ.

all cities have a governor

all cities are in states or provnies then country

all cities have people

difference

some are rich

some are poor

some are average

c

explanation: because you need to reduce the pollution on land,the exhaust fumes will stop,and stop it in water,the oil that is in the oceanharms the fish   sorry if you   have been waiting long