| Upright pyramid | Inverted pyramid |
|---|---|
| $1$. The pyramid of energy is always upright. | $1$. The pyramid of biomass and the pyramid of numbers can be inverted. |
| $2$. In an upright pyramid,the number and biomass of organisms at the producer level is the highest,decreasing at each successive trophic level. | $2$. In an inverted pyramid,the number and biomass of organisms at the producer level is the lowest,increasing at each successive trophic level. |
| Food chain | Food web |
|---|---|
| $1$. It is a single linear sequence of organisms showing the flow of energy. | $1$. It is a complex network of many interconnected food chains. |
| $2$. Members at higher trophic levels feed on specific,limited types of organisms. | $2$. Organisms have multiple alternative food sources,providing greater stability. |
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