Gross & microscopic anatomy of the alimentary canal. 
-This figure shows an intestinal villus. What is the structure indicated by the number 1?
Definitions:
Covariance
A measure indicating the degree to which two random variables change together.
Variances
Statistical measures of the dispersion of data points in a dataset, indicating how far each data point in the set is from the mean.
Portfolio
A portfolio of investment vehicles, including equities, fixed income, raw materials, money, and money-like assets, along with mutual funds and ETFs.
Covariance
A measure indicating the extent to which two variables change in tandem.
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