When the external form of a lake is measured, what is really calculated is it’s .

The length of a lake is measured as the longest straight-line shoreline-to-shoreline distance across a lake. ... Another important measurement is lake width (“W” in Figure 1), taken as the longest shoreline-to-shoreline measurement at right angles to the length.

Explanation:

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unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.