Questions

A chemical reaction in which involves the absorption of heat from the environment is called a Endothermic reaction. 

Examples : Dissolving ammonium chloride in water, photosynthesis, melting ice cubes, mixing of potassium chloride with water,...

In the contrast, chemical reactions involving release of heat are known as exothermic reactions.

Examples : Combustion, coal is burnt, mix of CaO with water,...

The femur is the longest bone in the human body. It is also called as thigh bone. Stapes in the shortest bone in the body that is present in the middle ear.

A duty is a task that is to be obeyed, followed and respected by all the citizens of the country or state.

The energy in most ecosystems comes from sun light.

Fluoride deficiency is a disorder which may cause increased dental caries due to a lack of fluoride in the diet. Dental caries or tooth decay is the breakdown of dental tissues by the acidic products released by the "bacterial fermentation of dietary carbohydrates”