Abstract: Biodiversity promotes all life on Earth, and refers to biological variety in all its forms, from the genetic make up of plants and animals to cultural diversity. People depend on biodiversity in their daily lives, in ways that are not always apparent or appreciated. Human health finally depends upon ecosystem products and services such as availability of fresh water, food and fuel sources which are necessary for good human health and productive livelihoods. Biodiversity loss can have significant direct human health impacts if ecosystem services are no longer adequate to meet social needs. Indirectly, changes in ecosystem services affect livelihoods, income, local migration and, on occasion, may even cause or exacerbate political conflict. Futhermore, biological diversity of microorganisms, flora and fauna provides extensive benefits for biological, health, and pharmacological sciences. Significant medical and pharmacological discoveries are made through greater understanding of the earth's biodiversity. Loss in biodiversity may limit discovery of potential treatments for many diseases and health problems.

Keywords: health, habitats, immune,tolerance, disease, environment.