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The answers are kidney and liver.
The kidney filters substances that are not good for the body like alcohol. However, it cannot function properly if the person keeps using alcohol.
Like the kidney, the liver has similar duties of detoxification. Alcohol chemicals are also excreted by the kidney, but it can only filter some amount every day.
They were called petroglyphs.
The strength of an association between variables is described by correlation, and it is typically captured by the correlation coefficient.
Its value ranges from-1 to +1. These are perfect positive and perfect negative correlations. Variables moving in the same direction are with positive correlation. And opposite moving variables are with negative correlation. All data points of a perfect correlation which ranges from -1 to +1, lie on a straight line.
The correlation coefficient shows the strength and direction between the two variables.
The most common method of calculating correlation is Pearson product correlation. Pearson correlation measures the linear relationship between two variables.
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Four of the country's thirteen largest cities are located on its banks: Nizhny Novgorod, Samara, Kazan, and Volgograd. The Kama River, which flows west from the southern Urals to join the Volga in the Republic of Tatarstan, is a second key European water system whose banks are densely populated.