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A alternativa correta é a letra "a": a) breathe - estimate - balancing - see. A frase completa seria: "Forests are key to producing the very air we breathe, yet forests are being depleted at a rate of 13 million hectares every year, according to UN statistics. Extinctions are happening at what scientists estimate to be about 1,000 times the normal pace. Not only are we losing some very special flora and fauna, but we are also balancing our ecosystems, throwing them out of balance, the effects of which we cannot anticipate because this it is such an incredibly intricate and complex system. The statistics can be incredibly shocking when you see them at first. The key is to use direct your outrage into action. Innumerable organizations have been working to protect local ecosystems for many under years, one of the most recent being the UN, who have set specific objectives under UNSDG 15, Life on land. Help us at GVI."
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