Ions that move across the cell membrane from low concentrations to high concentrations are most likely * diffusing through ion channels. using energy during the process of active transport. moving through a protein. both (a) and (b).

Which pair of sentences is describing the same velocity? a. a car is parked. a car is moving in circles. b. a bus drives 40 miles per hour north. a truck drives 50 miles per hour north. c. a boy walks east at 6 kilometers per hour. a girl walks west at the same speed as the boy. d. valerie rides her bike south at 8 kilometers per hour. owen jogs south at 8 kilometers per hour.