Try typing in the phrase you used, "how pastry art has changed over time". Try several search engines. The new one,
www.bing.com, may be more user-friendly for you. We have a search tool here as well.
(A heads-up:The culinary instructors here aren't fond of students trying get others to do their homework.
I'm an old teacher myself (secondary schools) and I can agree with them.
)