Which statement best describes a scientific theory? A. It can be proven incorrect during a single experiment B. It is created from one experiment and by one scientist. C. It can never be changed. D. It can be altered if new information turns up.

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?