Examlex
The kind of WBC that recognizes foreign antigens is the:
Oxygen
A chemical element with the symbol O, necessary for the respiration of most living organisms and for combustion processes.
Carbon Dioxide
A colorless, odorless gas produced by burning carbon and organic compounds and by respiration, absorbed by plants in photosynthesis.
Double-Blind Study
A research method in which both the subjects and the researchers are unaware of which group (test or control) the subjects belong to, to prevent bias.
Experimental
Pertaining to a methodical procedure carried out with the goal of verifying, falsifying, or establishing the validity of a hypothesis.
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