Is the annual productivity of a typical city backyard large enough to support a house cat or will the cat require food supplements in order for it to survive?

Question

Quizplus · Accepted Answer

The annual productivity of a typical city backyard may not be enough to support a house cat, and therefore the cat will require food supplements in order to survive. Even if there is a fruit tree in the backyard, it may not provide enough food for the cat. Additionally, the presence of grass alone will not provide sufficient nutrients for the cat's survival.

Is the Annual Productivity of a Typical City Backyard Large