A.............is a series of trophic levels in which there is repeated eating and being eaten by to transfer the food energy .

Explanation

**Step-by-Step Solution:**

1. **Understanding Trophic Levels**: Trophic levels refer to the different levels in a food chain, where each level represents a different group of organisms that share the same function in the food web. The primary levels include producers, primary consumers, secondary consumers, and tertiary consumers.

2. **Concept of Eating and Being Eaten**: In an ecosystem, organisms are interconnected through feeding relationships. One organism consumes another, which is referred to as "eating," while the consumed organism is said to be "being eaten." This relationship is fundamental in understanding energy transfer in ecosystems.

3. **Energy Transfer**: As organisms eat and are eaten, energy is transferred from one trophic level to the next. This transfer of energy is crucial for the survival of various species and the overall functioning of the ecosystem.

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