I guess I would say b or d. Because concluded results change over time with better technology and some solutions dont work.
It should be an explanation on what you wanna learn about in the experiment, it should be based on prior knowledge, it is also different from a prediction
It could occur after a forest fire or flood.
Light pollution<span> is excessive and inappropriate artificial </span>light<span>. The four components of </span>light pollution<span>are often combined and may overlap: Urban Sky Glow—the brightening of the night sky over inhabited areas. </span>Light<span> Trespass—</span>light<span> falling where it is not intended, wanted, or needed.</span>
