With the given scenario above, this will help researchers in
determining whether the individuals in the control group could experience
changes in which will be due to the drug agent used or either it is also
because of the expectations of the participants.
The answer is D hope I helped
Water- <span>While the earth may be mostly water, only about 2-1/2 percent of it is fresh water. Of that 2.5%, even less is considered to be potable. Potable water is water that is considered to be safe to drink and cook with.
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Air-</span><span>Clean air is necessary for the existence of life on this planet. It is essential for the existence of plants, animals and wildlife. It is important to reduce air pollution as polluted air degrades the environment and can enter our body and can cause health related problems. There are number of ways to keep the air clean and safe.
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. Soil-Another important natural resource is soil. Soil is composed of many different particles and nutrients in the soil helps plants grow.
