The best answer is C. Tailings are dangerous because they can release toxic elements into the groundwater or surface water. Tailings are the waste materials after the process of extracting the valuable part in a mine. These waste materials have a big potential to destroy the environment because they can release toxic substances which include arsenic and mercury. These tailings can contaminate water bodies.
A gene that has been associated with a language disorder in humans and is quite different in apes is the FOXP2 gene.
Which of the following is NOT a typical practice in growing rice in Asia?
A. preparing fields with a plow drawn by oxen
<u>B. flooding the plowed land with water
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C. transplanting the seedlings grown in a dry place to the flooded land
D. harvesting the rice by hand
E. arranging the fields in circular patterns
