Autotrophs make their own food and foxes are not able to do that since they are not green nor do they have green parts. That means that they are consumers of one sort or another.
Without seeing what the following is it a person will not be able to know how to show it is a food chain omnivore. To do this the information on what is being referred to is needed.
A potato is an autotroph.
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Autotroph is not a verb and therefore does not have a past tense. Autotroph is a noun.
autotroph, because it creates energy by itself from basic parts, using sun energy and CO2.
kingdom archaebacteria is both heterotroph and autotroph
The panda is an autotroph.