Courtney and kenzie are doing an experiment to determine which fish food gives their fish more energy. they have two fish tanks, each with the same number, size, and type of fish. the tanks are the same size and have identical filters and decorations. they were both filled with store-bought spring water and are cleaned at the same time. when the girls submitted their results to a journal for publication, scientists criticized the experiment. what about the experiment would need to be changed so that scientists might accept their findings?

There would need to be several more tanks of fish.

Explanation:

Just two fish farming tanks is too little for Courtney and Kenzie's research results to be considered correct. They need more tanks so that they can accurately assess their search results.

The biggest problem with having only two tanks is that, in this way, it is not possible to establish a control treatment that would provide data so that the two girls could compare the results of the tangues where the fish were fed with the feed with the result of the fish that were fed in another way.

The control treatment is one that receives all the variables that the other treatments, but does not receive the variable that is being tested in the experiment (in this case, the ration). In this way, the control treatment serves as a basis of comparison for the other treatments.

the answer is b: 1.4 km/hr

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.