Respectively means "one by one in the order designated or mentioned." Respectfully means "with respect."
Examples:
The central roles of ghost and detective are played respectively by comedians Vic Reeves and Bob Mortimer."My cat does not talk as respectfully to me as I do to her." (Sidonie-Gabrielle Colette)
Practice:
(a) Mike and Ike Johnson, a sixth grader and a fourth grader _____, begin every day with one hour of schoolwork.(b) "I _____ decline the invitation to join your hallucination." (Scott Adams)
