Catabolic reactions are reactions that break larger molecules down into smaller molecules, and often result in the release of energy as a by product of the bonds being broken. In fact, metabolism (the breakdown of food) is a catabolic reaction.
So the best answer would be the Answer no.4:
A => B + C + Energy
Unsaturated fatty acids.
Hope this helps! :)
I think that the best word to fill into the gap is "solid".
Solid comes in opposition to other fundamental states of matter: liquid, gas, plasma (the last one can be characterized by high electric conductance).
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Answer:
The question is non-existent