Which kingdom(s) contain organisms that can get energy by either method?

Kingdom protista contain organisms that can get energy by either method. They act like both plants and animals. They make their own food like plants from the sun due to the presence of chlorophyll while they also get energy by feeding on other animals so they use both autotroph and heterotroph mode of nutrition. These types of organisms is known as mixotroph.

a symbiotic relationship with the mitochondria