B. Because of the presence of hydrogen sulphide in Brass, it combines with oxygen in air and form water, evaporates. So remained sulphide is colourless in air .So Brass gets discoloured in the air.
The correct response that would illustrate the concept of how influenza is impacted by natural selection, requiring multiple influenza vaccines would be option B. That is, influenza viruses that are not eradicated by a flu shot can pass on their genome to future replicated viral particles.
According to natural selection theory by Darwin, members of a population that are poorly adapted to an environment gradually die off the population, while those that are strong enough produce equally strong offspring that gradually take over the future population.
In other words, influenza viruses that have no inherent attribute to resist the effects of the flu shot will get eradicated while the ones that are able to resist the effects will reproduce and pass on the resistance gene to their offspring. Thus, a new population that is resistant to the flu shot would be formed.
Options A, C, and D have nothing to do with natural selection. Hence, the only correct option is B.
More about natural selection here: brainly.com/question/9830102
Well, the average orbital speed of ceres is about 17.91 km/s if that helps. Sorry its not much of an answer
