Used today by much of the world, the Gregorian calendar is based on A. the ancient Hebrew calendar.
B. the Islamic calendar.
C. the cycles of the moon.
D. the movement of Earth around the sun.

D

Explanation:

a 365-day common year divided into 12 months pf irregular lengths

the proximity of water was an advantage to western europe and its culture was able to flourish as a result. trade and travel by sea were easier and safer in historical times.

1. there are no mountains to protect it from the sea

2. and its has wet cool summers and wet, mild winters.