Write on the following.
1. Extra terrestrial system.
2. Quorum sensing.
1 . Extraterrestrial refers to any object or being beyond (extra-) the planet Earth (terrestrial). It is derived from the Latin words extra ("outside", "outwards") and terrestris ("earthly", "of or relating to the Earth"). It may be abbreviated as "E.T." Is that extraterrestrial is originating from outside of the earth's atmosphere, from space, or from another planet; alien to earth or its environment.
2. Quorum sensing is a process of bacterial cell-to-cell chemical communication that relies on the production, detection and response to extracellular signalling molecules called autoinducers.