Trophic level of weasels and stoats in a biomass pyramid

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garytse86
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hello there I am doing an Edexcel past paper, and the question consists of 3 marks:

Q) Name the trophic level in a biomass pyramid that would include weasels and stoats. Explain your answer.

A) Carnivores as weasels and stoats eat other animals.

What is (possibly) the third mark?
 
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Sounds good to me but then what do I know?

Math, I'm good at! Physics, okay. Biology?

Any biology experts out there?
 
may be mathematics can explain why stoats should be carnivores?