Question

Define Epidemic and ecosystem ​

Answer 1

Answer:

epidemic-Epidemics of infectious disease are generally caused by several factors including a change in the ecology of the host population (e.g. increased stress or increase in the density of a vector species), a genetic change in the pathogen reservoir or the introduction of an emerging pathogen to a host population (by movement of pathogen or host). Generally, an epidemic occurs when host immunity to either an established pathogen or newly emerging novel pathogen is suddenly reduced below that found in the endemic equilibrium and the transmission threshold is exceeded

ecosystem-An ecosystem includes all of the living things (plants, animals and organisms) in a given area, interacting with each other, and also with their non-living environments (weather, earth, sun, soil, climate, atmosphere). ... Usually, biotic members of an ecosystem, together with their abiotic factors depend on each other.

Answer 2

Explanation:

widespread occurrence of an infectious disease in a community at a particular time.

a biological community of interacting organisms and their physical environment.