Peptic Ulcer - An open sore that develops on the inner lining of the stomach or upper small intestine.⏎
Organism - A living being that can reproduce, grow, react to external stimuli, and maintain its internal equilibrium.⏎
Parasitism - A close relationship between two organisms in which one organism, the parasite, benefits at the expense of the host organism.⏎
Reservoir - An organism in which a parasite that is pathogenic for some other organism lives and reproduces without harming its host.⏎
Reproduction - The process by which parent organisms create new offspring by either sexual or asexual means.⏎