shrimp

The government funded research that put shrimp on treadmills!

We could see that shrimp populations in the wild were declining in certain areas, for example.

Is it more bacteria in the water making the shrimp sick?

We could just give a correlation between certain factors and the shrimp.

To find out, you need to replicate; do something over and over again, varying the temperature, water pH, bacterial infection, and more, to find out which of the many options is causing the shrimp decline.