The people are laughing at God to insult him with these questions. Alternate translation: "But we will not believe that he can give us bread also or provide meat for his people until we see him do it." (See: [[rc://en/ta/man/translate/figs-rquestion]])
food from plants or food from animals. Though this is a merism for all kinds of food, it is best to translate it literally if possible. (See: [[rc://en/ta/man/translate/figs-rquestion]])