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:
The philosophes (French for 'philosophers') were writers, intellectuals and scientists who shaped the French Enlightenment during the 18th century. The best known philosophes were Baron de Montesquieu, Voltaire, Jean-Jacques Rousseau and Denis Diderot
Explanation:
It would be "Decreasing taxes and increasing spending on federal programs" that <span>contributes to a budget deficit, since this means that more revenue is "going out" than "coming in". </span>
Answer:
Japan was seriously harmed in WWII. In the case of Japan, industrial production decreased in 1946 to 27.6% of the pre-war level, but recovered in 1951 and reached 350% in 1960. One reason for Japan's quick recovery from war trauma was the successful economic reform by the government.
