Organisms (belonging to the same species) may adapt in different ways to better exploit different environments or resources-- survival of the fittest. They also may evolve varied characteristics for attracting mates for reproduction. This means that different groups evolve differently. Over time, these groups or populations may become so different that they can no longer breed together -- and separate species are formed.
Answer: Genetic Drift
Explanation: Genetic drift is an evolutionary mechanism whereby gene or allele frequency of a particular population change over generations due to random chance. The effect of genetic drift is most visible in small population due to reduction in population size resulting from natural disaster or splitting of a small group from the main population to formation a colony. However, it can occur in large population as well but it's effect is as strong as that occurring within a small population.
The genetic drift among the Dunkers could be attributed to the official split between conservatives and progressives members in 1882.
Because of the rain shadow effect, a dry region occurs on the downside of a mountain.
Option: A
<u>Explanation:</u>
In orographic rainfall, mountain acts as barrier and moisture laden wind get an obstacle in its path in the form of that mountain and cause rainfall in the windward sides of the hills (mountain) and create rain shadow region in the lee ward sides of the hills (mountain).
Because when moisture laden winds reach that side all the moisture in the winds dries up. For e.g. eastern part of western ghat mountain in the Peninsular India is an example of rain shadow region.
Answer:
To an important extent it is true that World War II was motivated by revenge, at least in Europe.
Explanation:
Germany, the main country that caused the war, had lost World War I just two decades earlier, and that loss meant the annexation of several of its former lands by neighboring countries, and the imposition of very expensive war reparation payments, that led to many economic problems in the country.
Many Germans were angry at their situation, and Hitler took advantage of this to sell the idea of revenge, but also of outright destruction.
