Refer to the table showing several prokaryote (bacterial) species (labeled A-E) that have been sequenced, along with the findings of the genes they contain.(Note: "x" marks the species possessing a functional copy of the gene.) Gene 1 is essential for the synthesis of several amino acids.Gene 2 encodes a protein involved in strengthening the cell wall.Gene 3 produces an enzyme that breaks down methane.The functions of the other five genes are currently unknown. 
What type of study best characterizes what the researchers did?
Definitions:
Marijuana
A psychoactive drug from the Cannabis plant, used both medicinally and recreationally for its psychoactive effects.
Alcohol Consumption
The intake of alcoholic beverages, potentially affecting an individual's physical and mental state.
Self-Conscious
An acute awareness of oneself, often leading to feelings of vulnerability or excessive concern about how one is perceived by others.
Sexually Daring
Exhibiting boldness or willingness to take risks in exploring sexual desires and engaging in sexual activities.
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