113. Read the passage about a science experiment
that Jacob conducted
Jacob took an empty water bottle and put the
lid on it. He then put the water bottle into a
boiling water bath After 5 minutes, Jacob
removed the bottle and immediately placed it
in a cold water bath.
Which of the following best explains what Jacob
observed?
The water bottle collapsed because the volume
"increased as the temperature decreased.
B. The water bottle collapsed because the volume
decreased as the temperature decreased.
The water bottle expanded because the volume
increased as the temperature decreased.
D. The water bottle expanded because the volume
decreased as the temperature decreased.

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.