Carbon monoxide
(Science: chemical) An organic byproduct of combustion, tasteless, odourless gas that competes with oxygen binding sites on the haemoglobin molecule.
early symptoms of carbon monoxide exposure include headache and nausea. Advanced exposure results in coma, cardiovascular collapse and death.
Plants and animals need elements, such as nitrogen, phosphorus, potassium, and magnesium for proper growth and development. Certain chemicals though can halt growth, e.g. herbicides in plants, or affect normal physiological activities, e.g. alcohol. For more info, read this tutorial on the effects of chemicals on plants and animals...
The human respiratory system is an efficient system of inspiring and expiring respiratory gases. This tutorial provides details of the different parts and functions of the respiratory system...