The termite gut protist, Mixotricha paradoxa, has at least two kinds of bacteria attached to its outer surface. One kind is a spirochete that propels its host through the termite gut. A second type of bacteria synthesizes ATP, some of which is used by the spirochetes. The locomotion provided by the spirochetes introduces the ATP-producing bacteria to new food sources. Which term(s)is (are)applicable to the relationship between the two kinds of bacteria? 1)mutualism 2)parasitism 3)symbiosis 4)metabolic cooperation
A) 1 only B) 1 and 2 C) 2 and 3 D) 1, 3, and 4 E) 2, 3, and 4