Areal differentiation represents one of the classic philosophical approaches to geographic inquiry. A central concept of areal differentiation is that the surface of the earth may be divided into regions, which may be distinguished and categorised using various spatial criteria. Thus, areal differentiation provides the theoretical foundation for regional geography, by conceptualising space as consisting of identifiable units that may be distinguished from one another on the basis of a set of phenomena or criteria. When there is similarity and dissimilarity among the physical and cultural features on the earth surface, it is called aerial differentiation.

A financial transaction is the instance, where there exists either an outflow or inflow of cash. For example: purchase of furniture or goods, sales of goods, etc. It is termed as a deal between two persons because here, two parties are involved in it, i.e. when goods are purchased.

Serum consists of plasma from which fibrinogens have been removed. It contains antibodies to counter act the effect to toxic substances of micro-organisms. It is the plasma without the clotting factors.

The heart is roughly cone shaped hollow organ. It is approximately the size of owner’s closed fist and weighs about 250-300 gm in female and 300-350gm in the male. The heart lies in the thoracic cavity in the space between the lungs (mediastinum) anterior to the vertebral column and posterior to the sternum. The heart consists of 4 chambers. At first, the heart is divided into the right and left side by the septum. Each side is further divided into 2 chambers each by the atrioventricular valve. The upper two chambers are called atrium and lower two are called ventricles. Atrium are thin-walled chamber separated by an interauricular septum

The right atrium receives impure blood from the body through the opening via superior and inferior vena cava. Ventricles are a thick-walled chamber. separated by the thick inter-ventricular septum.

The animal kingdom is also classified on the basis of the level of organization other than symmetry, germ layers, and body cavity.  Though the animals are multicellular, the level of organization varies from cellular and tissue level.

Cellular level: In this structural organization, each cell of the organism performs all life process e.g., Porifera.

Tissue level: In this structural organization, a tissue is made up of group similar type of cells that perform same functions and group of the same type of tissues forms organs. Such organs perform a specific function for the body.

Simply put, it's a collection of objects
Examples
N : the set of all natural numbers
Z : the set of all integers
Q : the set of all rational numbers
R : the set of real numbers
Z+ : the set of positive integers
Q+ : the set of positive rational numbers, and
R+ : the set of positive real numbers
Set of even numbers: {..., -4, -2, 0, 2, 4, ...}
Set of odd numbers: {..., -3, -1, 1, 3, ...}
Set of prime numbers: {2, 3, 5, 7, 11, 13, 17, ...}
Positive multiples of 3 that are less than 10: {3, 6, 9}
 

The Instructor’s work was over when he built a swimmer out of Douglas piece by piece and then put them together into an integrated whole. However, Douglas was not satisfied as the remnants of the old terror would return when he swam alone in the pool. He would frown on terror go for another length of the pool.

The thought of Roosevelt that there is terror in the fear of death had deep impact on Douglas. He had experienced both the sensation of dying and the terror of the fear of death. But later he brushed aside his fear by challenging it by the will to live and succeeded.

William Douglas had been a hydrophobic after meeting with two misadventures in his life especially the latter one wherein he was thrown into the deep end of the YMCA pool by a big bully. In order to overcome his fear of water, he hired a personal instructor who put a belt around his waist that was connected to rope and ran on an overhead cable through a pulley straight into the hands of instructor. When Douglas was about to drown, instructor would pull the rope which made Douglas come to the surface of the water. When he swam confidently, he would loosen the rope to let him free. This went on for few months and Douglas got to learn a lot with the help of his instructor. Besides, he learnt side stroke, breast stroke, paddling, inhaling and exhaling which made him more confident in water.

the ideas of liberty and democratic rights we are the most important Legacy of the French Revolution this is spread from France to the rest of Europe during the nineteenth century where fundamental systems where abolished in inspired the Germans italians and Australian to overthrow their oppressive resigns the French Revolution inspired the struggling nations of Asia and Africa who were groaning under the operation of European colonialism

Python is a case-sensitive language. This means, Variable and variable are not the same.

The city of Babylon had played an outstanding role in the ancient history of Mesopotamia. It was Akkad ruler, Sargon, who ruled from 2370 to 2315 BCE. Being situated on the north-west bank of river Tigris it made tremendous progress under Humurabiera. Babylon witnessed the emergence of glorious era of its history under Keldian ruler Nabopolassor. At that time, it covered an area of more than 850 hectares. Some magnificent features of Babylon were as follows:

• A triple wall was constructed all-around the city to safeguard it from any foreign threat.
• A massivq Ziggurat was the main center of attraction in Babylon.
• It was also a famous commercial center.
• The city had also made a tremendous progress in the field of language, literature, science, medicine, etc.

A man of the southern marshes, Nabopolassar, released Babylonia from Assyrian domination in 625 BCE. His successors increased their territory and organized building projects at Babylon. From that time, even after the Achaemenids of Iran conquered Babylon in 539 BCE and until 331 BCE when Alexander conquered Babylon, Babylon was the premier city of the world, more than 850 hectares, with a triple wall, great palaces and temples, a ziggurat or stepped tower, and a processional way to the ritual centre. Its trading houses had widespread dealings and its mathematicians and astronomers made some new discoveries.

1. Ur was a town whose ordinary houses were systematically excavated in the 1930s Narrow winding streets indicate that wheeled carts could not have reached many of the houses. Sacks of grain and firewood would have arrived on donkey-bac.

Narrow winding streets and the irregular shapes of house plots also indicate an absence of town planning. There were no street drains of the kind we find in contemporary Mohenjodaro

.

Drains and clay pipes were instead found in the inner courtyards of the Ur houses and it is thought that house roofs sloped inwards and rainwater was channelled via the drainpipes into sumps* in the inner courtyards

2. This would have been a way of preventing the unpaved streets from becoming excessively slushy after a downpour.

3. Yet people seem to have swept all their household refuse into the streets, to be trodden underfoot! This made street levels rise, and over time the thresholds of houses had also to be raised so that no mud would flow inside after the rains.

 Babylon witnessed the emergence of glorious era of its history under Keldian ruler Nabopolassor. 

Nabonidus was the last ruler of independent Babylon. He writes that the God of Ur came to him in a dream and ordered him to appoint a priestess to take charge of the cult in that ancient town in the deep south. He writes: ‘Because for a very long-time the office of High Priestess had been forgotten, her characteristic features nowhere indicated, I bethought myself day after day.

Then, he says, he found the stele of a very early king whom we today date to about 1150 BCE and saw on that stele the carved image of the Priestess. He observed the clothing and the jewellery that was depicted. This is how he was able to dress his daughter for her consecration as Priestess.

On another occasion, Nabonidus’s men brought to him a broken statue inscribed with the name of Sargon, king of Akkad. (We know today that the latter ruled around 2370 BCE.) Nabonidus, and indeed many intellectuals, had heard of this great king of remote times. Nabonidus felt he had to repair the statue. ‘Because of my reverence for the gods and respect for kingship,’ he writes, ‘I summoned skilled craftsmen, and replaced the head.’

The great Assyrian kings, who had been immigrants, acknowledged the southern region, Babylonia, as the center of high culture and the last of them, Ashurbanipal (668-627 BCE), collected a library at his capital, Nineveh in the north. He made great efforts to gather tablets on history, epics, omen literature, astrology, hymns and poems. He sent his scribes south to find old tablets. Because scribes in the south were trained to read and write in schools where they all had to copy tablets by the dozen, there were towns in Babylonia where huge collections of tablets were created and acquired fame. And although Sumerian ceased to be spoken after about 1800 BCE, it continued to be taught in schools, through vocabulary texts, sign lists, bilingual (Sumerian and Akkadian) tablets, etc. So even in 650 BCE, cuneiform tablets written as far back as 2000 BCE were intelligible – and Ashurbanipal’s men knew where to look for early tablets or their copies.