Why are echinoderma animals even though they have no brain?

Which of the following best describes asbestosis?

What term is given to the border between the central alps and the southern limestone alps?

Read the article titled "trans-saharan migration routes to north africa and the eu: historical roots and current trends." why do tens of thousands of sub-saharan africans try to cross the mediterranean each year? how are these refugees commonly portrayed? (site 1)