Question

Certain plastic items are called unbreakable. What is this material ? Write its formula in long

Answer 1

This is Thermosetting plastic.
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Answer 2

Only a fraction of the energy available at one trophic level is transferred to the next trophic level; the fractions can vary between 1-15%, with an average value of 10%. Typically the numbers and biomass of organisms decreases as one ascends the food chain.