Question

1. which of the following would strengthen the design of this experiment?

measuring the ph level of the ocean water in addition to the salinity
repeating the same experiment multiple times at different locations in the ocean
measuring the salinity of the water on an overcast day
using a different collection device for each ocean depth

Explanation:

To strengthen an ocean salinity experiment, increasing sample representativeness and reducing bias is key. Repeating the experiment across multiple ocean locations accounts for natural variability in salinity, making results more generalizable and reliable. Adding pH measurement introduces an unrelated variable, measuring on an overcast day limits scope, and using different collection devices introduces confounding variables from device differences.

Answer:

Repeating the same experiment multiple times at different locations in the ocean