Gradual changes in the frequency of diseases over long periods are known as SECULAR TIME TRENDS. For example, the rate of mortality in USA due to coronary heart diseases over a period of time. Onset of puberty in girls is also a secular time trend.
Secular time trend is also referred as Secular Variation and Secular Drift.
The person would have a problem with his metabolism.<span />
There has to be one side with a high concentration and another side with a lower concentration
The answer is B.
Sex cells are formed by a process called meiosis, not mitosis.