<span>people with an impulsive personality have a higher rate of substance abuse and dependence.</span>
It weakens the immune system making it unable to defend itself against viruses and it also attacks the immune system..
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Light that passes through a polarizing filter is called a vacuum.
Speciation is the process by which new species form. It occurs when groups in a species become reproductively isolated and diverge. In allopatric speciation, groups from an ancestral population evolve into separate species due to a period of geographical separation.
