biodiversity

What are the ways that preserving biodiversity locally have an affect globally: One of the ways that preserving biodiversity in one area, may affect the whole world is: the preservation of plants, animals, and different species in one are that may be extinct in another. this can have an affect globally because if the species goes extinct, then you have somewhere that it is being preserved, and therefor it is not totally extinct.
How do habitat destruction and loss of species affect more than just one area: if you have a very rare animal of plant, and it is native to only one area in the entire world, and it suddenly disappears because of habitat destruction or it was destroyed, it would have an effect on the rest of the world because it would be wiped off of the great map of existence completely, the only people who would remember or know of its existence at some time would die and then its memory would be completely gone, and once that is done, nothing can be done to get it back.
How does preserving biodiversity enhance the life of people: studies done by scientists actually did discover that there is a substance in natural, good earth and dirt that releases positive chemicals/enzymes that make you feel better, you are also naturally happy when your near nature, wether it be controlled or natural. Another way, is medicine, penicillin for example, we use it in the simplest of ways, but if we were suddenly unable to use it, or it was forever gone to humanity, the chaos it would cause would be unthinkable, sickness easily cured before would be harder to get rid of, and old sicknesses previously cured by penicillin. if biodiversity suddenly, and without explanation disappeared off of the face of the earth, then life would (probably literally) turn gray as stone and boring as watching the paint that contributed to the disappearance dry on the new house you just bought. we would be one of the only sentient being on the planet, plants we use and eat everyday would be gone, animals we love and cherish would disappear, and we would be utterly, and completely, alone in the world.