(a) Commensalism refers to the association of organisms wherein one organism is benefitted while other remains unaffected. For example, Whale and barnacles(b) Parasitism is an association of organisms where one organism is benefitted at the expense of other. For example, lice in the scalp of the human.(c) Camouflage refers to adaptation wherein organisms blend themselves with certain surroundings to avoid predators. A walking stick insect camouflage itself to disguise.(d)  Mutualism is an association of organisms wherein both are benefitted.  For example, Rhizobium and legumes. (e) Interspecific competition refers to competition between organisms of two different species for a common resource. For example, competition between leopard and lion for common prey.