These fossils are very useful for us because we can use them to date the layers of rock that they are found in. Fossils that can be used in this way are called index fossils, and rock layers with the same index fossils in them can be correlated. Not my answer, link here for full
http://peter-mulroy.squarespace.com/correlating-rock-layers/
The signs and symptoms of a cluster headache include severe<span> right-sided headache with a runny nose, droopy eyelids, and tearing of the eye on the right side.
</span>The injectable form of sumatriptan<span> (</span>Imitrex<span>), which is commonly used to treat a migraine, is also an effective treatment for acute cluster headache</span>
<span>Dreams for Survival Theory
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The dreams-for-survival theory states that dreams have helped humans evolutionarily by simulating threats, thus preparing people to fight for survival. It is also called the threat simulation theory.
<span>The theory stems from the notion that many dreams are stressful. When humans are dreaming, they are often dreaming of situations in which they need to fight to survive. This essentially provides practice for survival instincts and functions as a defense mechanism.</span>
Solar power/energy or hydroelectric plants
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