Final answer:
The sentence "Many animals have a keener sense of smell than humans do." contains both an adjectival phrase and an adverbial phrase.
Step-by-step explanation:
The sentence that contains both an adjectival phrase and an adverbial phrase is:
Many animals have a keener sense of smell than humans do.
In this sentence, the adjectival phrase is 'of smell' which modifies the noun 'sense', and the adverbial phrase is 'than humans do' which modifies the verb 'have'.
Learn more about Identifying adjectival and adverbial phrases