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.
Engineering may be the sum
Answer: Aaron Ogden was at the case
A) The South didn't need to conquer the North to win its independence.
The South was just planning on defending itself till the North grew tired, but the North had to conquer the South to be able to reunite the Union and win the war.
Answer:
A) Crop failures that led to bread shortages and starvation for the poorer classes.
C) Debt accrued by the treasury for its involvement in the American Revolution.
D) France's outdated estates system that gave the upper class too much power.
Explanation:
The French Revolution was the major game-changer of the whole of the French government. The decade-long revolution starting from 1789 to 1799 led to a number of changes in the political, and even social scene of the nation.
The major causes of the French Revolution were the ineffective ruling of the king, Louis XVI. Aside from that, the <u>immense crop failure</u> which led to the increased suffering of the poorer sections of the society led to the uproar. The people demanded changes were required so as to make everyone an equal part of the government. Moreover, their hardships were further led on by the <u>huge debt that France had after its involvement in the American Revolution</u>, which hugely impacted the financial condition. Added to that, the <u>Estates system where the upper class were given more power over the lower class </u>led to a major conflict of interest among the masses. All these factors led to the French revolution.
Thus, the <u>correct answers are options A, C, and D.</u>
