Oxygen is necessary to sustain most terrestrial life. Oxygen is used in cellular respiration and many major classes of organic molecules in living organisms contain oxygen, such as proteins, nucleic acids, carbohydrates, and fats, as do the major constituent inorganic compounds of animal shells, teeth, and bone.
From wingtip to wingtip, P. sandersi measured at least 6.4 meters. The wandering albatross, the worldâs largest living bird, has a wingspan of 3.5 meters, and the giant, extinct South American condor, Argentavis magnificens, was right around 6 meters.
The wandering albatross has the largest wingspan, at 3.4 meters. The kori bustard is the heaviest flying bird. It can weigh almost 20 kg. An extinct, vulture-like bird called the giant teratorn, Argentavis magnificens, weighed about 75 kg and had a wingspan of 8 meters!