Dan described two layers of Earth's atmosphere. Layer A: Allows long-distance radio communication
Layer B: Separates outer space from Earth's atmosphere

Which statement is most likely true? (5 points)

a
Layer A is the thermosphere and Layer B is the exosphere.

b
Layer A is the exosphere and Layer B is the thermosphere.

c
Layer A is the troposphere and Layer B is the stratosphere.

d
Layer A is the stratosphere and Layer B is the troposphere.

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?