Is it possible to have a food web without producers? Explain

There could not be life on earth without producers. They are at the bottom of the food chain and if one thing in the food chain dies then the whole food chain would get throne off.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.