To complete the flow of energy in a woodland ecosystem, we need to fill in the blanks with appropriate components that reflect the transfer of energy from the sun to the bird. A common flow in an ecosystem is from producers to consumers.
Here’s one way to complete the model:
sun → plants (producers) → insect (primary consumer) → bird (secondary consumer)
You could also express it in a slightly different way by omitting some levels but still achieving a similar meaning:
sun → plants → bird
Both completions show how energy flows from the sun to plants (which convert solar energy into chemical energy through photosynthesis) and then to animals like insects and birds as they consume plant matter (insects can be primary consumers that feed on the plants, while birds can be secondary consumers feeding on the insects).
Feel free to ask more if you need more examples or clarification!