Hello,
Your brainliest answer would be:
One there taste
There structure formulas are very different.
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Viruses challenge the cell theory because it states all cells arise from pre-existent cells. Also, viruses are considered non-living which challenges the first theory
Halley's Comet is the most well-known comet. It's a "periodic" comet that comes close to Earth once in 75 years, allowing a person to see it twice in his or her lifetime. It was last seen on Earth in 1986, and it is expected to appear in the year 2061.
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Thermometers must be returned to the manufacture for routine calibration