Thee of the main reasons why the Industrial Revolution occurred in America were because 1) there was a large labor force ready to work, 2) there were lots of coal and fossil fuel deposits that were used to power many of the engines in the factories, and 2) a democratic capitalist system was ideal for allowing businesses to thrive without much government oversight.
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.
Advice- Try looking it up because it has all the facts and explanation..
Answer:
Fort Sumter
<u>The civil war began primarily as a result of the long-standing controversy over the enslavement of black people.</u>
The war started in April 1861
The secessionist forces attacked Fort Sumter in South Carolina. After a month of Abraham Lincoln had been elected as the President of the United States.
