How did the use of irrigation affect life for the Mesopotamians?

Which two following best identify the central themes of this speech in the passage the man in the arena

What are the 28 countries in the eu?

Tides are caused by a differences in the gravitational force of the sun at different points on earth. differences in the gravitational force of the moon at different points on earth differences in earth’s gravitational field strength at different points on earth’s surfac fluctuations in the gravitational attraction between earth and the moon.