Why do certain human genetic disorders, such as sickle-cell anemia, occur more frequently among one ethnic group than another?

Certain human genetic disorders may occur more frequently among one ethnic group than another because of peoples ancestry being traced to a certain location in the world that may be more prone to specific human genetic disorders because of the conditions of the environment. also, people in different ethnic groups often share certain genes that may hold a disease-causing gene mutation.

1. when the tempature rises,your sweat glands and then springs into action making perspiration. some sweat evaporates with your skin taling heat with it.2.some of the blood pumped by the heart travels by your lungs to get rid of carbon dioxide and pick up oxygen.3.saliva produces by, you drinking water which saliva is 98% of. when mucus builds up in your body it also creates saliva as well as, antibacterial compunds.4.when the core body tempature drops, the shivering reflex is triggered to maintain homeostasis. for example: when you get out the pool you start to shiver because it is cold.

There is sand and mud