Why would an unpredictable flooding of the Nile cause political AND social upheaval?

Fill in the blanks using the following choices: resource,population,specialization,evolution,selection species diversity,the number and relative abundance of species present in a community,is affected by competition, which results in partitioning and

The flashing of directional signals as it indicates that used it safe to bed

Why is the road most slick when it first begins to rain? a. oils the road has absorbed begin to float. b. the water has not had time to run off. c. a higher concentration of dirt makes the road more slick. d. none of the above