Diseases that can be controlled by are considered environmental health concerns. a. improving sanitation in large urban areas
b. treating water
c. manipulating the environment
d. providing adequate health services to screen for and control diseases
e. all of the above

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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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