the molecule has no nitrogen atoms
You could carbon date the material to better evaluate how long the bones have been there and how long ago the organism lived.
the answer is avoli, because they are the smallest part of the lungs so the carbon dioxide goes back through the blood stream to be reoxygenated by the pulmonary system.
"The notion of ecological niche is central to ecological biogeography, which focuses on spatial patterns of ecological communities."Species distributions and their dynamics over time result from properties of the species, environmental variation..., and interactions between the two — in particular the abilities of some species, especially our own, to modify their environments and alter the range dynamics of many other species." Alteration of an ecological niche by its inhabitants is the topic of niche construction. The majority of species exist in a standard ecological niche, sharing behaviors and adaptations similar to the other closely related species within the same broad taxonomic class, but there are exceptions. A premier example of a non-standard niche filling species is the flightless, ground-dwelling kiwi bird of New Zealand, which feeds on worms and other ground creatures, and lives its life in a mammal-like niche. Island biogeography can help explain island species and associated unfilled niches."