Question
Differentiate between an Expanding age pyramid and a Stable age pyramid. Substantiate your answer with diagrams.
| Expanding age pyramid | Stable age pyramid |
| The population of pre-reproductive age is greater than population of reproductive age | The population of pre-reproductive age equals to population of reproductive age |
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The diagram above is that of a typical biogas plant.Explain the sequence of events occurring in a biogas plant. Identify a, b and c.