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pronto socorro financeiro para economias em crise controlado pelos EUA

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In the experiment, the researchers determined the relative abundance of two bacterial species found in the rumen of cattle. The rumen is a part of the stomach that acts as a fermentation chamber in cattle and other ruminants. Shown in the table are the results from before and after an abrupt change in the cattle's diet. Based on the results, which of the following best explains why the initial hypothesis should be revised?AThe diets were too similar, since cellulose and starch are both carbohydrates obtained from eating plants.BThe abundance of one of the bacterial species increased in response to the change in diet.CThe change in the diversity of microorganisms had no observable effect on cattle physiology.DThe ability of rumen fluid to resist changes in pH counteracted the changes in microorganism diversity.

If a dam is built downstream and prevents salmon migration to the test sites, which of the following most accurately predicts the impact on nitrogen influx?ANitrogen influx will increase because the bears will no longer store nitrogen from the salmon.BNitrogen influx will decrease because there will be less bear-salmon interaction.CNitrogen influx will remain stable because organisms other than bears and salmon will mobilize nitrogen in the environment.DNitrogen influx will increase because bears will no longer lose nitrogen to the salmon.

Which of the following statements most directly supports the claim that different species of organisms use different metabolic strategies to meet their energy requirements for growth, reproduction, and homeostasis?ADuring cold periods pond-dwelling animals can increase the number of unsaturated fatty acids in their cell membranes while some plants make antifreeze proteins to prevent ice crystal formation in tissues.BBacteria lack introns while many eukaryotic genes contain many of these intervening sequences.CCarnivores have more teeth that are specialized for ripping food while herbivores have more teeth that are specialized for grinding food.DPlants generally use starch molecules for storage while animals use glycogen and fats for storage.

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