Reproduction - The process by which parent organisms create new offspring by either sexual or asexual means.⏎
Reservoir - An organism in which a parasite that is pathogenic for some other organism lives and reproduces without harming its host.⏎
Natural Selection - The process by which certain heritable traits that contribute to the survival and reproductive success of an organism become more widespread within a population over successive generations.⏎
Pathogen - A biological agent that causes disease.⏎