Small intestine is modified due to the presence of micro villi which has ability to increase it's size
When you observe and compare specific physical traits of different birds you will learn that some birds have characteristics that help them live and survive in their own habitat that other birds may not have but make up those birds have characteristics that help them in their own habitat.
•move
•maintain homeostasis
•require and use energy
•respond to stimuli
•reproduce
•grow and develop
•display organization
•made up of one or more cells
This role would be the organisms niche. None of the other choices make any sense. A nesting site is not a role, a biomass is not a role, and territorial range is not the role an animal has in its community. A niche is an organisms role in its community, how it interacts with the things around it, where it lives and what it does.