which of the following was an affect of farming on the development of early river valley civilization

Surplus food allowed groups of people to specialize and stratify, which led to laws and governments. ... Because farming produced extra food, people were able to form less permanent settlements.

length of the cultivating season was not a problem of new england agriculture

aug 15, 2012 - although van leeuwenhoek was not the inventor of the microscope, he advanced it more he loved to grind and focus a new lens in order to see the unseen world. most of leeuwenhoek's microscopes were silver. in a simple but significant experiment (1668), he demonstrated that worms found on