There are several species of grain beetles that can live on dry meal obtaining water mostly as metabolic water.Many of these beetle species are grain pests that do considerable damage to stored grain.You set up a dozen jars of dry meal and introduce fifty individuals of each species to each jar,being careful to have half of each species from each sex.The food supply is sufficient to last for a year and the size is adequate so that wastes do not become toxic.Most likely,examination of the jars in six months will find

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Since all species would be competing directly for the same food resource the species that could make the most efficient use of the resource would likely out compete the others and the other species would die out. This is the same as the results that were seen in the experiment with paramecium.Bloom's

There Are Several Species of Grain Beetles That Can Live