Transition Zone - The area, sometimes referred to as an ecotone, encompassing the edges of two distinct ecosystems, such as the area where a forest intersects with grassland.⏎
Virus - An infectious agent that is only capable of replicating itself inside the living cells of other organisms.⏎
Strain - A genetic variant or specific subtype of a microorganism, such as a virus or bacteria.⏎
Symptom - A subjective indication of the presence of disease or a departure from the body’s normal state of functioning. ⏎
Species - One of the most basic units of biological classification, ranking just below the genus and comprising individuals or populations capable of interbreeding.⏎