The Diplomonads and Parabasalids are the two groups that are adapted to anaerobic conditions and contain modified mitochondria that lack DNA.
<u>Explanation:</u>
The existence of a mitochrondrial-remnant organelle and nonfunctional, named a mitosome distinguishes diplomonads. Parabasalids are distinguished by a semi-functional mitochondria termed as hydrogenosome; they are made up of parasitic protists, including Trichomonas vaginalis.
Diplomonads function in anaerobic circumstances, and use alternate pathways to generate energy, like glycolysis. Growing cell of the diplomonad has two identical nuclei and utilizes multiple locomotive flagella. Trichomonas vaginalis, a parabasalid that induces a human sexually transmitted infection, uses these pathways to pass via the urogenital tracts of males and females.
