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:
C. The Freedman's Bureau
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Explanation:
(1865–72), during the Reconstruction period after the American Civil War, popular name for the U.S. Bureau of Refugees, Freedmen, and Abandoned Lands, established by Congress to provide practical aid to 4,000,000 newly freed African Americans in their transition from slavery to freedom. Headed by Maj. Gen. Oliver O. Howard, the Freedmen’s Bureau might be termed the first federal welfare agency. Despite handicaps of inadequate funds and poorly trained personnel, the bureau built hospitals for, and gave direct medical assistance to, more than 1,000,000 freedmen. More than 21,000,000 rations were distributed to impoverished blacks as well as whites.
Answer & Explanation:
The country's economic woes were made worse by the fact that the central government also lacked the power to impose tariffs on foreign imports or regulate interstate commerce. Thus, it couldn't protect American producers from foreign competitors
Muslim women who wear burqas believe that under the constitution, freedom of expression (of beliefs, opinions etc.) allows them to wear a burqa without fear of breaking the law or being discriminated against
