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.
Understand latitude. latitude measures how a point is north or south of the equator. now understand longitude, longitude measures how far a point is easy or west of the prime meridian. understand how they appear on a map. now, i’m not the best at helping or explaining, so if this doesn’t help... then hopefully someone else answers for you.
22. D, that means the soil uhhhh helps the roots to grow??? Also because sunlight causes photosynthesis- sorry i’m not good at this hope it helps
Explanation:
Since Charles found that the volume is directly proportional to temperature when the mass and pressure remain constant this means that with increase in temperature, there will be increase in volume.
Mathematically, 
at constant Pressure
This equation represents the relationship in Charles' law.
The best and most correct answer among the choices provided by your question is the second choice or letter B.
Reptiles don't sit on their eggs like birds do because r<span>eptile eggs are not amniotic and have no shell, so sitting on them would crush them.</span>
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