Indiana is home to fossilized crinoids. these small, sea-dwelling invertebrates are vaguely reminiscent of starfish, and some species of crinoid are still present on earth today, but these animals were especially common in the world's oceans about 400 million years ago. how is this information important to the theory of evolution?

Several bird species feed in a certain species of tree. each bird species feeds in a different part of the tree. which statement is true of these bird species? a. they have adapted to different niches due to competition b. they have a carnivorous relationship with the tree species. c. they have adapted to different niches due to predation d. they have a symbiotic relationship with the tree species.