Question 4 1 pts In the U. S., consumers have choices for which pizza company to order from. They make these choices based on quality and price. The reason they have this choice is because of what characteristic in the U. S. economy? O Free Market Competition Private Property O Profit Motive​

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?