Dissociative amnesia is a type of dementia that is different from amnesia. Normally this type of amnesia is a subconscious attempt to bury painful memories (which also accidentally bury other memories). Thing is those memories are not lost forever but are deeply hidden though events may flash periodically especially if there are triggers.
"D"
Homeostasis is literally maintaining normal body function. For example, sweating because you are hot, to maintain the right body temperature(which is a body function)c is maintaining homeostasis.