Explanation:

Search engines work by crawling hundreds of billions of pages using their own web crawlers. These web crawlers are commonly referred to as search engine bots or spiders. A search engine navigates the web by downloading web pages and following links on these pages to discover new pages that have been made available
Answer:
b. Biography
Explanation:
A biography can come in handy when you want to deliver something inspriring and motivational to people around the world in one go.
Answer:
the adjective in the sentence is lovely
Its location made it a center of trade, which led to the exchange of ideas.