The genus Dahlia is situated in the Asteroideae subfamily of the Asteraceae, in the Coreopsideae tribe. Within that tribe it is the second largest genus, after Coreopsis, and appears as a well defined clade within the Coreopsideae.
Aerobic respiration. Definition. noun. (1) A form of cellular respiration that requires oxygen in order to generate energy. (2) The process of generating energy by the full oxidation of nutrients through Krebs cycle where oxygen is the final electron acceptor.
Fields relating to the environment: 1  Aerobiology (pronunciation) â The study of airborne organic particles.  Astrobiology (pronunciation) â The branch of biology concerned with the effects of outer space on living organisms and with the search for extraterrestrial life.