Which of the following is the correct order that the planets and stars followed when they formed? big bang --> planet is formed --> star is formed big bang --> clouds and planets form --> star is formed big bang --> clouds of dust --> dust starts to condense --> planet or star is formed star is formed --> planet is formed --> big bang --> cloud of dust

Cells in the nervous system have a potential difference of 70 mv across the cell membrane separating the interior of the cell from the extracellular fluid. this potential difference is maintained by ion pumps that move charged ions across the membrane. is this an emf? select the correct answer and explanation. 1)no. the ion pumps cannot separate charges; thus, they cannot create a potential difference. 2)yes. the ion pumps cannot separate charges, but they still can create a potential difference. 3)yes. the ion pumps can actively separate charge; thus, they can create a potential difference. 4)no. the ion pumps can separate charges, but they cannot create a potential difference.