Thanks team. I found a nice little revision site on food chains that you might like to try, find it at Food Chain Game.
Now to your question. Firstly it might be a little difficult putting all living things into one food chain. Secondly do you think it would be humans? Ecologists (They are scientists who specialise in studying the living environment) rank species by their diets using a metric* called the trophic level scale. Plants, which produce their own food, are given a rank of 1. Herbivores, which eat only plants, are ranked 2. The fiercest of meat-loving predators, such as killer whales, are rated at 5.5. Humans are rated at 2.5 which is the same level as a pig.
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* metric as a noun means a standard scale of measurement so you could call a temperature scale a metric or any other standard scale of measurement a metric.
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(updated 13/9/17 -changed metric to measurement)
(updated 15/9/17 – ‘measurement’ back to ‘metric’ after realising it was the correct word in the context in which it was presented, added addendum explaining it’s use as a noun)