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:
Russia entered World War One on the side of the Allies against the coalition of Germany and Austria-Hungary (the Central Powers) in 1914. The Russian army performed very badly during the war, suffering several defeats, numerous casualties and losses. There were also famine and production shortages in the country in those convulse years. The people were desperate and very angry with the tsarist government. TheTsar was forced to abdicate in February 1917, a moderate government took place. In November 1917, the Bolsheviks organized a succesful revolt and took power. Causes? Military distaster, food scarcity and famine, political and social chaos, weakness of the central authorities; all those factores contributed to the Russian Revolution of 1917.
Explanation:
Answer:
The author feels that Young has made many mistakes.
The author also feels that Young was determined.
Answer:
The ettlement in the western United States
Native Americans sent to reservations
The foundation of the Populist Party
Explanation:
The construction of the Transcontinental Railroad, as well as the discovery of gold, silver, and copper in many western states, led to the rapid settlement of the western United States. By 1890, 430 million acres in the Far West were settled, much more than the previous 250 years.
After 30 years of war, 250,000 Native Americans who lived on the Great Plains were enclosed in reservations to allow the westward settlement.
The Populist Party was founded with the support of western farmers affected by the depression that arose in rural America who wanted a political voice against the railroad tycoons.
Answer:
D. The repetitive motion of the steam engine
Explanation:
Got it right
