in an experiment, students put brine shrimp in water with different concentric s

Question

in an experiment, students put brine shrimp in water with different concentric salt and counted the number of living shrimp after 24hours which is the following changes to the experiment will increase confidence in the validity of the results?
reduces the lengthy of the experiment from 24 hours to 8 hours
add more brine shrimp to the water with the highest salt concentrations
count the number of dead brine shrimp instead of living brine shrimp
repeat the experiment several times, and calculate the average number of brine shrimp

Explanation / Answer

Brine shrimp need salt water along with other factors of the environment. Brine shrimp lives in cyst before born. When conditions are right the babies will hatch. They are tough and the can handle different amounts of salt. Depending on the conditions they live it can take one week to 6 weeks for the babies to turn into adults.

So i think last option increase confidence in the validity of the results. Repeating the experiment will provide the average values which would be more accurate.

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