Ecological succession provides diversity and depth to a biotic community. Without it, life can not grow or progress. ... ( I don’t know if this will help you but here you go. )
B: They represent different concepts.
The difference in arrival time between the two types of seismic wave can<span> be </span>used to calculate<span> the distance of the </span>earthquake's epicenter<span> from the seismometer, as the further away an </span>earthquake<span> is, the greater the lag time between the detection of the S </span>waves<span> relative to the P </span>waves<span>.
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