Why did independent city-states develop in ancient greece? choose all answers that are correct. a. some of the city-states were isolated because they were islands. b. independent city-states provided protection against attack from other countries. c. the mountains separated groups of people from one another. d. people depended on the many navigable rivers for travel and communication.

Which of the following statements about this graph is accurate? world grain production has increased in every year since 1950. the amount of grain grown between 1950 and 1980 decreased. world grain production has generally increased between 1950 and 2010. more grain was grown in 1950 than in any other year.

This excerpt reveals that elinor is select all that apply

Which sentence best explains how steam power changed agriculture in england between 1810 and 1850? a. farmers started using steam-powered machines to spray chemical fertilizers and pesticides. b. livestock farmers began using steam-powered machines to milk cattle and shear sheep. c. steam-powered railways transport and sell agricultural produce far from where it was grown. d. steamships to transport large numbers of people from the united states to english farms.