One from the major human activities that leads for the irreversible biodiversity loss may be the overexploitation of certain animals. This occurs once the human destruction or using a species outpaces that species' ability to reproduce. This often occurs certain organisms are highly prized by humans, which could be the case with animals and plants whose parts are utilized as medicinal therapies in certain societies. Sadly, three in the Earth's eight type of tiger happen to be extinct. What's worse? The five remaining species are gravely endangered, partly due for the demand for their bones, which can be considered to treat arthritis, and erroneously believed to reverse male impotence. Exploitation also affects plants also including popular wild-grown medicines ' including Echinacea, the normal cold remedy. Korean Ginseng has been used in China as a sexual tonic for about 7000 decades. It is a fact that many people are blessed naturally to supply a beautifully poised public speech. However, i am not saying that others cannot give such speeches they just have a very concern with public speaking. What they should use is study and employ to become good public speakers. However, while this, there is something to remember as a speaking in public advice.