Supply the missing alkyl halide reactant in the elimination reactions shown below. 
Definitions:
Organic Subunits
Basic building blocks of organic molecules, which include structures like amino acids, nucleotides, and monosaccharides.
Protocells
Early, simple, cell-like structures that are considered precursors to true cells, playing a role in theories of the origin of life.
Genome
An organism’s complete set of genetic material.
Hydrothermal Vents
Gaps on the ocean floor releasing warm water abundant in minerals, which foster distinct biological communities.
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