As food reaches the end of the esophagus, it enters the stomach through a muscular valve called the lower esophageal sphincter. The stomach secretes acid and enzymes that digest food. Ridges of muscle tissue called rugae line the stomach. The stomach muscles contract periodically, churning food to enhance digestion.Mar 4, 2016
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.
A college campus including the students, birds, trees, sidewalks, and air makes up one complete ecosystem.
Ecosystem consist all the plants and animals living in an area along with their environment in other words biotic and abiotic component of the environment together consist ecosystem.
Ecosystem can be of various types- Forest ecosystem, grassland ecosystem, desert ecosystem and tundra ecosystem.
An area that has its own flora and fauna and are constantly interacting with each other can be considered as ecosystem.
Hence a college campus including the students, birds, trees, sidewalks and air can makes up an ecosystem.
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