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In a closed ecological system, any waste products produced by one species must be used by at least one other species. If the purpose is to maintain a life form, such as a mouse or a human, waste products such as carbon dioxide, feces and urine must eventually be converted into oxygen, food, and water.
I found this: Castor<span> includes two extant species, the North American beaver (</span>Castor canadensis) (native<span> to North America) and</span>Eurasian<span> beaver (</span>Castor fiber<span>) (Eurasia). Beavers are known for building dams, canals, and lodges (homes). They are the second-largest </span>rodent<span> in the world (after the</span>capybara<span>).
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This could lead to the decrease in the areas sea star population. If there is not enough food, the animals may not be able to survive.
The foramen magnum is really important feature for bipedal mammals (basically, animals that walk on two feet). It's basically a whole in the base of the skull that allows the spinal cord to connect the lower body to the brain. Hope this helps!