The placebo effect is a procedure in which a patient is made to believe that a drug has a direct on the person. Therefore improving his/her symptoms from the said disease that he/she is experiencing. It is directly injecting or making a procedure using alternatives. The idea is that the patient would believe such measures were done and that they will be cured from their diseases. There are no video clips available on you questions but I hope this helps.
a branch of biogeography concerned with the geographic distribution of animals and especially with the determination of the areas characterized by specific groups of animals and the study of the causes and significance of such groups
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"Chronic poor" is when someone is in poverty for a long amount of time and sometimes it can mean their in poverty for their entire life.
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