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Alveoli are microscopic air sacs in the lungs. During inspiration (breathing in), oxygen diffuses from the air in the alveoli into the blood. At the same time, carbon dioxide carried in the blood diffuses...

DNA and RNA have many similarities. They are both formed of a backbone made from sugar and phosphate groups, however DNA is formed of the sugar deoxyribose, and RNA is formed of ribose sugars. Attached to...

Ultrafiltration in the Bowman's capsule- happens due to high pressure created by the difference in diameter of the Afferent and Efferent arterioles. Glucose now in filtrate and not blood.Glucose then trav...

Conversion of answering gas into Nigerian containing compounds. Lightning can cause this, but there are also two types of bacteria which perform this role:
1) Mutualistic N-fixing bacteria: live in n...

Always start with planning. Even if there is little time, mind map briefly as many points that you could talk about. Ideally you need to write about at least five.Always start the essay with a brief intro...