Bird field guides once listed the Asian and North American populations of the White-winged
Scoter as a single species based on morphological similarities and the fact that their migratory
ranges overlap during the summer season. Current guides list them as two species, however the
White-winged Scoter and Stejneger's Scoter. The reclassification of the White-winged Scoter
into two separate species was based on a reevaluation of the birds using the Biological Specles
Concept (BSC). To classify them as two separate species under the BSC, biologists must have
found the Whitewinged Scoter and Stejneger's Scoter.m never interact in the wild. cannot
successfully reproduce. cat different foods. the in different environments, New variants of
coronavirus (SARS-CoV-2) have evolved periodically during the Pandemic. Some variants such
as Omicron and its subvariants have proven to be more transmissible and virulent than the
original strain, which appears in Dec. 2019. The graph below is a molecular clock of the
mutation rate--nucleotide substitutions ( Y -axis) by time ( X -axis). The original strain is
represented in the lower, left corner (0 mutations in Dec. 2019). Each dot is a unique coronavirus
sample. The black line is the average mutation rate across all samples. You discover a new
variant that differs from the original strain by 40 nucleotide substitutions. Based on the average
mutation rate, what is your best estimate for when this new variant first appeared? Nov.-Dec,
2021 May-Jun. 2021 Mar-Apr. 2020 Nov.-Dec. 2020 Sep.-Oct. 2021.
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Bird field guides once listed the Asian and North American populations.pdf
1. Bird field guides once listed the Asian and North American populations of the White-winged
Scoter as a single species based on morphological similarities and the fact that their migratory
ranges overlap during the summer season. Current guides list them as two species, however the
White-winged Scoter and Stejneger's Scoter. The reclassification of the White-winged Scoter
into two separate species was based on a reevaluation of the birds using the Biological Specles
Concept (BSC). To classify them as two separate species under the BSC, biologists must have
found the Whitewinged Scoter and Stejneger's Scoter.m never interact in the wild. cannot
successfully reproduce. cat different foods. the in different environments, New variants of
coronavirus (SARS-CoV-2) have evolved periodically during the Pandemic. Some variants such
as Omicron and its subvariants have proven to be more transmissible and virulent than the
original strain, which appears in Dec. 2019. The graph below is a molecular clock of the
mutation rate--nucleotide substitutions ( Y -axis) by time ( X -axis). The original strain is
represented in the lower, left corner (0 mutations in Dec. 2019). Each dot is a unique coronavirus
sample. The black line is the average mutation rate across all samples. You discover a new
variant that differs from the original strain by 40 nucleotide substitutions. Based on the average
mutation rate, what is your best estimate for when this new variant first appeared? Nov.-Dec,
2021 May-Jun. 2021 Mar-Apr. 2020 Nov.-Dec. 2020 Sep.-Oct. 2021
