Biologists can grow specific plants to detoxify an area contaminated with heavy-metal pollution using the method of (blank). To rid an area of mosquitoes, biologists introduced a species of fish into bodies of water that feed on the mosquito larvae. This method is an example of(blank) .

1. Bioremediation

2. Biological Control

Explanation:

Bioremediation is the process in which the environmental condition of the contaminated media such as land, water and soil is altered with the growth of microorganisms and plants to treat the contamination.

So, biologist used the method of bioremediation, by using specific plants that will detoxify the area contaminated with heavy-metal pollution.

Biological control is the method in which pests such as mites, weeds, insects  and plant diseases are controlled by using other organisms.

So, here also biologist used biological control method and introduced  species of fish into bodies of water to control mosquitoes development.

Hence, the correct options for the blanks are 1. Bioremediation and 2 . Biological Control.

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i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.