Read the summary of an online article. Answer the question that follows.

Ornithologist Dr. Messer explains the similarities and differences between an osprey and a bald eagle by expounding upon the characteristics shared relating to migration, feeding, and mating habits. The key takeaways will also cover the discrepancies between the two species.

What is the text structure of this essay?

Cause and effect
Compare and contrast
Problem and solution
Sequence