What does the topic sentence of a paragraph do

Read the excerpt how the grimm brothers saved the fairy tale. which idea does the author introduce first

Diego rivera was a famous artist from mexico. most of his paintings were murals. murals are paintings that are made directly on a wall. rivera thought that all people should be able to see beautiful art, not just people who could afford to go to museums. this is why he painted most of his murals on the walls of public buildings

What inference about haida families can be brawn from the actions foc the sky chief