Question

contractions per min
30
25
20
15
10
5
0
very low low medium high very high
salt concentration
based on the data in the graph, which would most likely happen if the paramecium were placed in distilled water?
the contractions would increase.
the contractions would decrease.
the contractions would cease altogether.
the contractions would establish dynamic equilibrium.

Explanation:

The graph shows that as salt concentration decreases (from very high to very low), contractions per minute increase. Distilled water has a very low (near - zero) salt concentration. Following the trend, placing paramecium in distilled water (lower salt than "very low") would likely increase contractions.

Answer:

The contractions would increase.