The correct answer should be because they want to establish a sense of time passing by and things changing over the course of time. Each new era is influenced by the previous one so the way time passes is important because as time passes by things change and the historians monitor it and record it in a chronological order.
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Polar molecule has diff charges positive nd negative but the non polar molecule does not it has an equal charge.
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A non-polar molecule doesn't have anything in the molecule that cause it to be attracted to water or other polar molecules making it hydrophobic, like oil in water.
A polar molecule has groups on it that give it a charge and cause it to be attracted to other polar molecules. Like alcohol in water. Alcohol is polar due to the -OH group attached to it causing it to miscible in water.
A group of organisms that are the same species in an ecosystem would be called a population.
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<span>The Northeast’s rocky and jagged shoreline provides many habitats.
Hope this helps you.
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