The flying buttress works by a. transferring the downward thrust of the roof to buttresses that stand away from the building b. using lots of decoration so that the building looks lighter in weight c. allowing birds to perch in them, who then fly away d. using concrete to support the building

for many centuries, the catholic church has been a patron of the arts. the church has used various scientific methods to maintain its power.

not 100% sure though!

for those of you who searched "which list includes four types of animal-like protists? " and keep getting these results, the answer is c: flagellates, sarcodines, ciliates, parasites