how does comparative advantage benefit developing nations

The importance of maintaining the ecological balance and conservation of the resources has been increasingly becoming clear in the last two decades. It has now become necessary for all countries in the world to recognise this fact and plan what is known as 'sustainable development'. The ..

Haeckel (1834-1919) formulated that 'ontogeny recapitulates phylogeny'. This means that the developmental stages that an organism goes through repeat the evolutionary history of the group to which the organism belongs. Stages in Embryological Development Though it does not expla..

A cocoon may contain many fertilised eggs. However, only one of them develops at the expense of the others. Development is direct. There is no larval stage. A fully grown young worm crawls out of the cocoon in about two or three weeks. The young worm resembles the adult, except ..

Interrelationship of Population, Environment and Development - As mentioned earlier man's intervention is causing drastic changes in the environmental systems of earth and disturbing its ecological balance. This disturbance gets compounded with the problem of population explosion in the w..

. The earth's earliest atmosphere may have contained hydrogen, helium, methane and ammonia, similar to the present atmosphere of Jupiter. Or it may have contained a large amount of carbon dioxide, as does the atmosphere of Venus. The earth's earliest atmosphere probably did not contain mu..

A national park is a tract of land reserved and maintained by a national government solely for the welfare of the entire wild life in it. Cultivation and grazing are not allowed in national parks. Private ownership is not allowed. There are at present 85 national..

Area which is dedicated for conservation of the environment, natural objects and the wildlife therein. Other forestry operations are prohibited but it is open to visitors who should not disturb or harm the protected plants or animal..

A person may develop immunity in three different wa..

Light in some cases, for example in Salmon larvae, accelerates development where as in Mytilus larvae it retards ..

Extremely low and high temperatures retard the growth and development of plants. Low temperatures are known to cause dessication, chilling injury and freezing injury to plant..