Editing 1991: Research Areas by Size and Countedness

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! Explanation
 
! Explanation
 
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|{{w|Marine mammal|Marine}} {{w|Mammalogy|Mammology}}''[sic]''
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|{{w|Marine mammal|Marine}} {{w|Mammalogy|Mammology}}
|They range in size from the {{w|Marine Otter}} (about 1m) to the {{w|Blue Whale}} (up to 30m).
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|They range in size from {{w|Marine Otter|about a meter}} to {{w|Blue Whale|up to 30 meters}}
|About 125 non-extinct species.
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|Marine mammals are the largest extant animals. The US Government [http://www.nmfs.noaa.gov/pr/species/mammals/ recognizes] 119 marine mammals. However, what constitutes each species is [https://www.marinemammalscience.org/species-information/list-marine-mammal-species-subspecies/ constantly being revised], with new studies indicating either that what used to be considered a subspecies is actually a separate species, or that what used to be considered a separate species is actually a subspecies. As the depths of the ocean are further explored, species that were outright unknown are spotted and need to be classified. However, since marine mammals breathe air and thus must surface, it's likely that all species have been observed by scientists.
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|Marine mammals are the largest extant animals. The US Government [http://www.nmfs.noaa.gov/pr/species/mammals/ recognizes] 119 marine mammals. However, what constitutes each species is [https://www.marinemammalscience.org/species-information/list-marine-mammal-species-subspecies/ constantly being revised], with new studies indicating either that what used to be considered a subspecies is actually a separate species, or that what used to be considered a separate species is actually a subspecies. As the depths of the ocean are further explored, species that were outright unknown are spotted and need to be classified. However, since marine mammals breathe air, they have to come to the surface where we can see them, so we're pretty sure that we've spotted all species. Note that Randall has misspelled Mammalogy with o instead of a in the middle.
 
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|{{w|List_of_Presidents_of_the_United_States|Presidential History}}
 
|{{w|List_of_Presidents_of_the_United_States|Presidential History}}

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