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.
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Scientists observing something then they try to explain what has been seen. The explanation is called a hypothesis.
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Explanation:
English because of the laugueg
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for the forest your primary producers will be any types of plant: trees, bushes, bromelaids, fungi. and liana.
Sugar-Phosphate and hydrogen bonds
