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.
Answer: space or shelter, ability to reproduce
Explanation:
Electrons are Negative.
Protons are Positive.
Neutrons are No charge.
Molecules are Made of atoms.
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