The correct answer is the mountain frogs in a lab setting with no UV rays exposure.
The frog populations, which do not acquire the ultraviolet radiation would function as a good control group. In this case, as the influence of the radiation is the variable under examination, thus, a group that acquires no radiation would exhibit no variation, and thus, would function as a control group that could be compared against the frogs, which do receive the radiation.
This answer would be FALSE! Smog is a combination of two things: 1. an emission of something that will cause a haze (i.e. burning of fuel-coal, etc...) and 2. natural fog.
If the two combine, then we will get smog. Therefore, if we cut down on our fuel burning and pollutants within the environment, we could also cut down on smog.
Answer:
carbon dioxide
Explanation:
we inhale oxygen and exhale the carbon dioxide
CARBON is essential to life do to its ability to form stable bonds with many elements including itself.
This is because carbon is the main element in organic compounds, making it a necessity for life on earth.
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