Henry: Some scientists explain the dance of honeybees as the means by which honeybees communicate the location of whatever food source they have just visited to other members of the hive.
Henry's Conclusion
There must be some explanation (besides trying to send the location of food) for the honeybees' dance.
Henry's Evidence
They don't need a complicated mechanism like a dance to send the location of food; they could just leave a scent trail from the food to the hive.
Winnie's Response
There doesn't necessarily need to be some other explanation. (i.e. the honeybees' dance may genuinely be to guide other honeybees to a food source.
Winnie's Evidence
Most animals have multiple ways to accomplish the same task (some bees can navigate using position of Sun or by using memory of landmarks), so even though honeybees can use a scent trail, they can also use a dance.
Evaluate
Why did Winnie mention how bees navigate? It was an example of the claim, .
These bee species are animals. A critical task is navigating. They have multiple ways: using position of the Sun or the memory of landmarks.
Goal
In the context of Winnie's argument, the two different ways that some bees navigate is support for an Intermediate Conclusion (most animals have several ways of accomplishing critical tasks), which is then support for her Main Conclusion that .
In the context of how it relates to Henry's argument, he was kind of assuming that . So Winnie's two-ways-to-navigate example is undermining one of Henry's assumptions.