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Wolves are extremely opportunistic carnivores, and will, given the opportunity, eat another wolf.

That aside, unclear how wolves relate to the topic.

Generally speaking, most life on Earth doesn't even eat other living organisms, but the naturally left remains of living organisms.

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We all know what you meant to say, but plants are living organisms.

This is why using selective terms for the type of dietary intake is scientifically useful. Carnivores that eat other carnivores (on a preferential basis) are rare. Typically herbivores are eaten by omnivores or carnivores. The only real moralities involved in these distinctions relate to energy efficiency and likelihood of diseases being a concern. Of course self awareness (sentience) is an additional layer of consideration on top of the evolutionary pressures.

Just to be clear, I'm referring to detritus as the primary source of nutrition for living organisms.

Learn more about detritus here:

https://en.m.wikipedia.org/wiki/Detritus

If by generally speaking you mean micro-organisms, then sure. I cannot think of any animals (mammals, fish, etc) that do not eat living organisms.

Try most of them?

Name just one. If you think it's most of them, name a few. I will explain it to you then.

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