Construct a pyramid of biomass starting with phytoplankton. Label its three trophic levels. Is the pyramid upright or inverted ? Justify your answer.

Explanation

### Step-by-Step Solution:

1. **Identify the Trophic Levels**:
- The first trophic level consists of **phytoplankton**, which are the primary producers.
- The second trophic level consists of **zooplankton**, which are the primary consumers that feed on phytoplankton.
- The third trophic level consists of **fishes**, which are the secondary consumers that feed on zooplankton.

2. **Construct the Pyramid of Biomass**:
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