Who proposed the 10% law ?

Explanation

**Step-by-Step Text Solution:**

1. **Understanding the 10% Law**: The 10% law refers to the principle in ecology that states that only about 10% of the energy from one trophic level is transferred to the next level in an ecosystem. This means that when energy is passed from producers to primary consumers, and then to secondary consumers, only a fraction (10%) of the energy is retained at each level.

2. **Energy Flow in Ecosystems**: In an ecological pyramid, the energy flow starts from the sun, which provides energy to producers (like plants). For example, if the sun provides 1000 joules of energy to producers, only 10% (which is 100 joules) is available to the primary consumers that eat the producers.

3. **Further Energy Transfer**: Continuing this process, the primary consumers that receive 100 joules will only pass on 10% of that energy (which is 10 joules) to the secondary consumers. This pattern continues up the food chain, with energy diminishing at each level.

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