What situations/conditions lead to the start of primary succession

Drag each tile to the correct location. match each trait that an organism displays to a reproductive strategy.

Veins have a much lower blood pressure than arteries. which of these prevents backflow of blood in veins? a. pressure applied by the heart b. one–way valves in veins c. thin muscular walls of veins

Development has provided electrically for less money but what may be considered a cause of nuclear power