Ant surveys are so highly-regarded as ecological indicators that governments worldwide accept their results when assessing the environmental impact of mining and tree harvesting. __________
Why not? Because many companies cant afford the expense or the laboratory time needed to sift results for a comprehensive survey. The cost stems, also, from the scarcity of ant specialists. __________
A This allowed scientists to gauge the pace and progress of the ecological recovery.
B Yet in other businesses, such as farming and property development, ant surveys arent used widely.
C Employing those people are expensive.
D They do this by sorting the ants, counting their numbers and comparing the results with those of earlier surveys.
E The evolution of ant species may have a strong impact on our ecosystem.
F Others will die out for lack of food.
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