Identify the stalk-like structure labeled A in the diagram. 
Definitions:
Theory of Evolution
The scientific explanation for the diversity of life on Earth, proposing that species change over time through processes such as natural selection and genetic drift.
Modern Synthesis
A comprehensive, unified explanation of evolution based on combining previous scientific theories, especially of Mendelian genetics with Darwin’s scientific theory of evolution by natural selection.
Mendelian Genetics
The study of inheritance and genetic variation, based on principles first proposed by Gregor Mendel regarding how traits are passed from parents to offspring.
Unified Explanation
A comprehensive explanation that consolidates multiple theories or observations into a single coherent framework.
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