An experiment measures the growth of crystals in a liquid solution aboard the space shuttle. a collection of bottles has the liquid in varying strength, or concentration of the tested substance. what would be a control observation in this experiment? a. the bottle with 0% concentration b. the bottle with the weakest concentration c. the bottle with the strongest concentration d. the bottle with the medium amount of concentration

A. the bottle with 0% concentration

Explanation:

In teh bottle with the 0% concentration you can create a control observation of the experiement to see how it beheaves even if it has no concentration and if it really depend on the substance added or is something that happens naturally in those environments.  Remember that when doing experiments you should always have a sample of the subject that is given nothing in order to observe the normal behaviour of the subject under no studies.

i would think it's food chain