i think it is maybe (A) maybe..
Streamlined bodies for swimming?
A placebo is kind of a "fake" treatment but, typically the person receiving a placebo is unaware it has no medical effect on them so they believe they are feeling better. For example, a lot of anxiety meds are placebos and people don't know so their brain tricks them into thinking they are feeling less anxious. This could be used in experiments where a group believes they are affected to see how they react
<span>When looking to power your equipment or vehicle with natural gas. A lot of people use natural gas in their homes for cooking and heating, but they don’t really give it some thought. So, let’s see what natural gas is and how it’s different from other </span>forms of fossil fuels<span> like oil and coal.</span>
