Final answer:
Ebola is the disease responsible for killing about one third of chimpanzees and gorillas in Africa. This high mortality rate disease has exacerbated the struggles of these primate populations, which are also under threat from human activities such as deforestation and poaching.
Step-by-step explanation:
The disease known as Ebola is killing approximately one third of the chimpanzees and gorillas in Africa. Human activity, including logging, agriculture, and civil unrest, has greatly affected the habitat of these primates. Ebola, which causes hemorrhagic fever, has a very high mortality rate and affects both humans and nonhuman primates, with outbreaks occurring primarily in remote areas of West Africa. Gorillas, particularly, have been heavily impacted as their populations are already under severe stress due to poaching and habitat destruction.