Resource conservation is the conservation of resources so that these are used in a limited manner and should not be overused.
it is necessary because humans do not use these resources in a limited manner. they use it as a greedy person.

(i) Relief, parent rock or bedrock, climate, vegetation and other forms of life and time are important factors in the formation of soil.
(ii) Various forces of nature such as change in temperature, actions of running water, wind and glaciers, activities of decomposers, etc. contribute to the formation of soil.
(iii) Chemical and organic changes which take place in the soil are equally important.
(iv) Soil also consists of organic (humus) and inorganic materials.

Various factors such as common race, language, religion, aims and aspirations, culture and Shared past gave rise to nationalism.
The following factors were responsible for the rise of nationalism in Europe :
(i) Decline of Feudalism. There was a steady decline of federal lords and many of them died in mutual warfare. The crusades also improverished the barons. Federal lords were the major obstacle in the emergence of nationalism, and without their destruction the cause of nationalism might have greatly suffered.
(ii) Weakening Authority of the Pope. The Church enjoyed supreme and exalted position and commanded a great power in the middle Ages, but the Reformation movement as well as the Renvai-ssance led to awakening among the people and weakened the authority of the Pope. As a result, national churches and national states were established in many countries.
(iii) Wars. Wars roused nationalism among the people of both France and England. The Hundred Years’ War between in the two countries gave rise to national feeling both in France and England.
(iv) Foreign Rule. The foreign rulers suppressed the people and treated them cruelly and mercilessly. This led and united the people against the foreign rule and infused the spirit of nationalism in them.

Some organisms that use the anaerobic mode of respiration are - yeast, bacteria.   

Given : ∆ABC, right angled at A.  BL and CM are medians. 

To prove :  4(BL2 + CM2) = 5BC²

The ability of an element to form bonds with other atoms of the same element is called catenation.

It is the binding of an element to itself through covalent bonds to form chain or ring molecules.

Examples : Carbon is the most common element that exhibits catenation property. That means it can form long hydrocarbon chains and rings like benzene.

Giuseppe Mazzini was an Italian revolutionary who founded two underground societies; first Young Italy in Marseilles and then Young Europe in Berne.

Giuseppe Mazzini was an important figure in liberal natioanlism. He made a significant contribution to the unification of Italy.

By 1830, Giuseppe Mazzini put forward a coherent programme of a unitary Italian Republic formed a secret society named Young Italy to inspire them with ideas of unification.

Inspired by Mazzini several Secret societies sprang up in many European states to train revolutionaries and spread their ideas.

He inspired the youth of Italy with natioanlist ideas.

He believed God intended nations to be natural units of mankind and Italy could not continue to be a patchwork of small states and kingdoms.

He founded the underground secret societies Youth Italy Italy and Young Europe to involve the youth in revolutionary activities.