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Which Is the Layering Variable in the Following Crosstab

question 28

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Which is the layering variable in the following crosstab??
 


Definitions:

Monotreme

A mammal that lays eggs instead of giving birth to live young, such as the platypus and echidnas, belonging to the most primitive order of mammals.

Therian

A subgroup of mammals that includes marsupials and placental mammals, distinguished from monotremes.

Morphologically Resemble

To share physical similarities in form and structure with another species or entity.

Common Ancestor

An ancestor that two or more descendants have in common, from which they have diverged through the process of evolution.

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