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In a fractionating column there is a temperature gradient that goes from being very hot at the bottom, to much cooler at the top. Crude oil is a mixture of hydrocarbons of different lengths, and we know ...

When it’s too hot, vasodilation occurs, in which the capillaries near the surface of the skin increase in diameter, allowing more blood to flow through them, releasing heat. Hairs on the skin lie flat. Th...

Leaves have a large surface area so more light hits them. The upper epidermis of the leaf is transparent, allowing light to enter the leaf. The palisade cells contain many chloroplasts which allow light t...

The tone of a text relates to the author's attitude towards the subject. This can be found in the diction, syntax, setting, and other narrative and thematic details. These same details can tell us about t...