Energy pyramid illustrating trophic levels in an ecosystem.

To solve this problem, we need to fill in the labels for the "Energy Pyramid" on the right side. An energy pyramid shows how energy moves through an ecosystem, starting from the bottom and going up. Energy decreases as you go up each level.

Step 1: Identify the Bottom Level (Level 1)
The widest part at the bottom represents the organisms that produce their own food using sunlight. In the diagram, you can see the sun shining on this level. These are called Producers (or Autotrophs). Examples include plants, algae, and grass.

Step 2: Identify the Second Level (Level 2)
The next level up consists of animals that eat the producers. Since they eat plants, they are herbivores. In ecological terms, they are called Primary Consumers.

Step 3: Identify the Third Level (Level 3)
The level above primary consumers consists of animals that eat the primary consumers. These are carnivores or omnivores. They are called Secondary Consumers.

Step 4: Identify the Fourth Level (Level 4)
The next level up consists of animals that eat secondary consumers. These are often larger predators. They are called Tertiary Consumers.

Step 5: Identify the Top Level (Level 5)
The very top of the pyramid represents the apex predators. These animals have no natural predators in their ecosystem. They are called Quaternary Consumers (or Apex Predators).

Summary of Levels from Bottom to Top:
1. Producers
2. Primary Consumers
3. Secondary Consumers
4. Tertiary Consumers
5. Quaternary Consumers

Now, let's match these to the boxes in the image. The boxes on the right correspond to the horizontal layers of the pyramid, starting from the bottom.

* Bottom Box: Producers
* Second Box from Bottom: Primary Consumers
* Third Box from Bottom: Secondary Consumers
* Fourth Box from Bottom: Tertiary Consumers
* Top Box: Quaternary Consumers

Final Answer:
From bottom to top, the trophic levels are:
1. Producers
2. Primary Consumers
3. Secondary Consumers
4. Tertiary Consumers
5. Quaternary Consumers