Nanometer - A unit of length equal to one one-billionth (1 x 10-9) of a meter.⏎
Peptic Ulcer - An open sore that develops on the inner lining of the stomach or upper small intestine.⏎
Reproduction - The process by which parent organisms create new offspring by either sexual or asexual means.⏎
Parasitism - A close relationship between two organisms in which one organism, the parasite, benefits at the expense of the host organism.⏎