Why does genetic variation increase the chance that some individuals in a population will survive? Genetically diverse populations display high phenotypic variation. If changing environmental conditions favor a particular phenotype there is a good chance that genetically diverse population will have some individuals who have that advantageous phenotype.
As well, the candles produce large particles in their smoke and there have been concerns about how safe it is to regularly breathe in this smoke. Mosquito coils: Like citronella candles, mosquito coils produce a smoke that confuses mosquitoes. The coils contain the insecticide allethrin.
Oil of citronella is a naturally occurring insect and animal repellent distilled from two grass varieties. It is yellow to brown and has a grassy/floral smell. Oil of citronella is a mixture of many components.The exact composition varies by grass variety.However, the main components are citronellol, citronellal, and geraniol.t is yellow to brown and has a grassy/floral smell. Oil of citronella is a mixture of many components. The exact composition varies by grass variety. However, the main components are citronellol, citronellal, and geraniol.