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What is the meaning (semantics) of the following Python expression?sum([x**2 for x in L])

Which selfish genetic element are viruses thought to have originated from? 

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Sulfur dioxide has a vapor pressure of 462.7 mm Hg at –21.0°C and a vapor pressure of 140.5 mm Hg at –44.0°C. What is the molar heat of vaporization of sulfur dioxide? (R = 8.31 J/K⋅mol)

SF6(g) can be used as an insulating gas between glass panes of a window. If the temperature of the gas is 10°C, what is the average speed of the gas?

Henry’s law states that gas solubility is

What are the semantics of the following Python code ? sum([x**2 for x in L])

A dataframe named df_data that has three columns: num_item, price and ID (all of them are numerical values and no missing values).  The following statement(s) will compute the mean for the price and the num_item:

A substance that dissolves in water and conducts electricity when present in an aqueous solution is

Generate an 10X10 matrix as a list of lists using list comprehension.  All elements of this matrix are ones except the diagonal elements are zeros. This should be one line of code