Is there any way make a food web for the entire planet?

It is possible, but it will be very long and messy due to there are too many organism that can consume similar organism also not every organism have been discovered yet.

 Hi

your answer to this responese is

The Food Web is an important ecological concept. Basically, food web represents feeding relationships within a community. It also implies the transfer of food energy from its source in plants through herbivores to carnivores . Normally, food webs consist of a number of food chains meshed together. Each food chain is a descriptive diagram including a series of arrows, each pointing from one species to another, representing the flow of food energy from one feeding group of organisms to another.

i hope this helps you

have great evening

FaithRawlins14