Identify by marking an X in the appropriate column, whether each of the following items would likely serve as a source document. The first one is done as an example: 
Definitions:
Heredity
The genetic transmission of characteristics from parents to offspring.
Environmental Factors
Constitutes the external elements, including physical, chemical, and biological aspects, that can influence living organisms.
Meiosis
A process of cell division resulting in four daughter cells each with half the number of chromosomes of the parent cell, as in the production of gametes and plant spores.
Chromosomes
Structures within the nucleus of cells that are made up of DNA and proteins and carry genetic information.
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