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.

What first caused people to consider that the continents were once one large landmass?

Which ecosystem best fits the characteristics listed below? which ecosystem best fits the characteristics listed below? ii. seasonal migrations of millions of wildebeests, zebras, and elephants iii. large numbers of predators, such as lions iv. acacia trees and grasses a. the congo rainforest b. the african mangroves c. the serengeti grasslands d. the sahel

Which arrow is closest to laguna madra bay? a. 1 b. 2 c. 3 d. 4