Plants would be the only option, they have no legs so they can't move. They are producers and make its own food and unable to move around its environment.
Answer:
Chloroplast............... Is one of them
To answer your question: the nucleus has a membrane.
No. It was an idea that yielded common positive results. “Not a good theory” is biased terminology. New technology can yield new information, but it does not mean that it was not a good theory.
