Answer:
The authority of EPA set several standards for drinking water quality,water suppliers,localities etc.
Explanation:
The regulations are-
1) National Primary Drinking Water regulations-
This regulation is legally possible which is applied in public water system.Primary standards protect public health by controlling the contaminants present in drinking water.
2)National Secondary Drinking water Regulations-
These regulations don't set any proper guideline to control contaminants present in water.
3)Unregulated Contaminants-
The Safe Drinking Water Act (SDWA) is a process through which EPA have to enlist the unregulated contaminants that are require in National drinking water regulations.EPA uses there unregulated contaminants and collect data that will help us to determine that whether we have to regulate that contaminants or not.
When a horizontally positioned plant responds to gravity, then auxins in the lower sides of the stems cause cell elongation that bends the stem upright. The correct option among all the options that are given in the question is the first option. This action is mainly due to the nature of the plants to grow towards sunlight.
C.) <span>infancy, childhood, adolescence, adulthood
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