Changes

*Cell Walls - The [[Cell Wall|cell walls]] of individual [[Cell (Biology)|cells]] can act as a barrier to [[virus]]es entering the [[Cell (Biology)|cells]].

: [[Plant]]s produce a number of [[chemical]]s which have [[antiseptic]] or [[antibiotic]] properties.

: When [[plant]]s become distressed they give off pheromones which cause nearby [[plant]]s to also produce [[antiseptic]] and [[antibiotic]] [[chemical]]s, preventing [[pathogen]]s from spreading.