Veins have a much lower blood pressure than arteries. what prevents backflow of blood in veins?

Type the correct answer in the box. use numerals instead of words. fiona has a lovely flower bed in her yard. she wants to add a fence along one side of the flower bed. the fence material is sold in meters. fiona knows that her flower bed is 200 centimeters in length. how much fencing material does fiona need in meters? fiona needs meters of fencing material for her flower bed.

What drives the atp synthase reactions that produce atp

During convection, less dense fluid rises and denser fluid sinks.