I think the accurate answer to this question, based from the sources, is light, hollow bones. The adaptation to fly in birds helps these organisms to stay away from terrestrial predators thus, they can amount to greater diversity and variation.Thank you for your question. Please don't hesitate to ask in Brainly your queries
Depending on the context you may consider antonyms to ostentatious such as reserved or modest. The word you are looking for is something like patina or tarnish.
