Name two ways that friction can be harmful while riding a bicycle?

Aside from low birthrates and high death rates, what can cause a country’s population to decline

How did justinian attempt to revive the “glory of rome”?

Which statement best describes standard oil in the late 1800s? standard oil controlled only a small number of the nation’s oil refineries. standard oil was a single business that operated in a small region. standard oil controlled only the means and methods of oil production. standard oil owned ninety percent of all oil refineries in the united states.