Copper deficiency is a rare disease that leads to hematological disorders. It is an essential trace element. It is an essential part of some enzymes (c0-factor) that plays role in cellular respiration. Copper is also an anti-oxidant that scavenges free radicals. In case of cellular respiration copper is responsible for electron transfer of oxygen.
Well fungi usually feed off of the decomposing matter of dead creatures and nutrients around it, while animals usually feed off plants or living things. fungi is a decomposer while animals are just consumers.
Answer:
I would recommend reading the descriptions and then reading the passage/story if you have not done that yet.
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The answer is : Your feet