1. Answer;
They evolved separately as they moved north and became two separate species.
Explanation;
The greenish warblers weren't geographically isolated, but they migrated around the Tibetan Plateau, evolving separately until they were no longer able to interbreed when both species (East and West) contacted in Siberia.
Greenish warblers were thought to have evolved from a single ancestral population that gradually diverged into two new species as it expanded northwards around the Tibetan plateau.
2. Answer;
- Their plumage patterns.
- Genetics and history
Explanation;
West Siberian greenish warblers (P. t. viridanus) and east Siberian greenish warblers (P. t. plumbeitarsus) differ subtly in their plumage patterns, most notably in their wing bars, which are used in communication. While viridanus has a single wing bar, plumbeitarsus has two. Around the southern side of the ring, plumage patterns change gradually.
Additionally, the two northern forms viridanus and plumbeitarsus are highly distinct genetically, but there is a gradient in genetic characteristics through the southern ring of populations. The greenish warblers were once confined to the southern portion of their range and then expanded northward along two pathways, evolving differences as they moved north. When the two expanding fronts met in central Siberia, they were different enough that they do not interbreed.
Answer: Large number of Loyalists
Explanation:
<span>This is of course somewhat of a subjective question, but in general most would agree that the Roman Republic owned its success more to the military, because this is how it was able to claim territory. </span>
The tobacco industry develops in North Carolina "around the cities of Winston-Salem and Durham."
The development of industry in North Carolina started after the American Civil War.
The development was pioneered by James Duke around 1865. The development began following the innovation of Bull Durham Smoking Tobacco by Bull Jack, which was later improved upon by Patterson.
James Duke started the American Tobacco Company during this period.
Hence, in this case, it is concluded that the correct answer is option D. "around the cities of Winston-Salem and Durham."
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