A fast-growing town requires a new source of power. Because the town is located by a fast-flowing river, the town council votes to construct a hydroelectric power plant. This requires a dam to be built. How might this activity affect the local watershed? The hydroelectric plant will likely flood the area behind the dam that is constructed.
The hydroelectric plant will likely pollute the water flowing down the waterfall.
The hydroelectric plant will likely pollute the air above the waterfall, leading to acid rain.
The hydroelectric plant will likely quit operating in the summer when the river dries up.

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation:

the "power" of a lens is its resolution power, or its ability to distinguish between to closely located points. with the low power lens, it is likely you will see the rough form of the hay and maybe some movement of dots around the hay. however, when observed with the high power lens, the detailed features of the hay become visible and the microbes being grown are more clearly visible.

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