Biological Agent (Terrorism) - A bacterium, virus, or other biological toxin used in bioterrorism or biological warfare.⏎
Chronic Disease - Any disease that is long lasting (3 months or more) or recurrent—as opposed to an acute disease—and cannot be prevented by a vaccine or cured by medication.⏎
Cell - The smallest unit of living matter capable of functioning independently.⏎
Chromosome - An organized structure of DNA and proteins within the nucleus of a cell that contains many genes.⏎