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Informal marriage was common in all but which of the following groups:
Critical Levels
Threshold values of pollutants or environmental conditions above which detrimental effects on specified sensitive elements of the environment are observed.
John Audubon
An American ornithologist, naturalist, and painter known for his studies, drawings, and paintings of North American birds.
Passenger Pigeons
A species of bird that once existed in enormous numbers in North America but went extinct in the early 20th century due to overhunting and habitat destruction.
Ornithologist
A scientist who studies birds and their behaviors, habitats, and physiology.
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