Answer:
The control variable is the soldier.
Explanation:
The same soldier is used throughout the test
Fossil fuels release carbon dioxide gas when they burn which adds to the greenhouse effect and increases global warming. Of the three fossil fuels, for a given amount of energy released, coal produces the most carbon dioxide and natural gas produces the least.
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Well, the range is more limited. Let's say if you tried listening to Denver radio all the way in Texas, you wouldn't be able to listen to it.
Another one is that other electromagnetic waves with similar frequencies can interfere with each other
Answer:
Infrasound
Explanation:
Infrasound, sometimes referred to as low frequency sound, describes sound waves with a frequency below the lower limit of audibility.
Answer:
C
Explanation:
Biodiversity is the difference and variation in a given area
