An unrooted tree linking three species (A, B, and C) is shown. Draw all possible unrooted tree conformations when a fourth species, D, is added to the tree. 
Definitions:
Cohort Differences
Cohort differences refer to variations in characteristics, attitudes, or experiences among groups of individuals who were born around the same period.
Longitudinal Studies
Research designs that involve repeated observations or measurements of the same subjects over a period of time, often years or decades, to track changes and developments.
Cross-Sectional Studies
Research design to analyze data from a population, or a representative subset, at one specific point in time.
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