Science is a dynamic subject and it changes all the time. In the science field, research is always on going and when new evidence are discovered about a particular topic, the new evidence are usually used to update the scientific information that is already on ground. All the areas of science listed about have enjoyed scientific updates in the recent.
All cells have these four parts in common: a plasma membrane, cytoplasm, ribosomes, and DNA
It is 3, just because he doesn’t have it, doesn’t mean he isn’t a carrier for it