応/おう/こた

Question 1

に応じて

Answer 1

“Choose B depending on A.” B has many levels.

名　+　に応じて
名　+　に応じた　+　名

Question 2

に応えて/にこたえて

Answer 2

“In response to A, B”. A is normally a question, wish, request or hope. Subject has control over B.

名　+　にこたえて
名　+　にこたえる　+　名