I think the answer is b i could be wrong
Answer: D- a mechanism for evolution
Explanation: The mechanism for evolution refers to the changes in allele frequencies within a single population.
There are four fundamental forces of evolution: Natural Selection, Genetic Drift, Mutations and Gene Flow
One of the main controversial issues in population genetics is concerned with the relative importance of both mechanisms in determining evolutionary changes
Answer:
As the English, French, and Spanish explorers came to North America, they brought tremendous changes to American Indian tribes. ... Diseases such as smallpox, influenza, measles, and even chicken pox proved deadly to American Indians. Europeans were used to these diseases, but Indian people had no resistance to them
Answer:
Explanation:
The Bessemer process was invented by Henry Bessemer and was used for the production of steel from molten pig iron.
The Bessemer process had the following advantages:
1. Steel could now be produced in bulk
2. The process of making steel became less labor-intensive
3.Due to its small and compact size, major repairs can be carried out within short periods of time
Shortfalls of the Bessemer process:
1. The Bessemer process was not able to remove the phosphorous found in the Pig iron of some types effectively, thus making it inefficient in that aspect
2. Steel produced through the Bessemer process always had retention of a small amount of Nitrogen from the air blast which adversely affected its structural stability and longevity when used for construction.
3. The Bessemer process usually produces inferior quality steel associated with blow holes and inclusions
