the fuedal system
Capillary system is where gas exchange occurs
Respiratory system
1. A closed system is a system which is isolated so that it cannot exchange matter or energy with its surroundings.
The system of our body that deals with blood transport and exchange
Methods of separation are: decantation, filtration, sieving, electromagnetic, centrifugation, distillation, ion exchange, gravitational system, elutriation, radiometric sorting, zone refining, sublimation and many others.
The feudal system was based on permanent heritable land grants in exchange for services. At its origin these services were military services, so the crown (the ultimate landowner) granted large tracts of land to nobles and in exchange the nobles pledged to provide so many knights or footsoldiers in case of war. Those great nobles could grant part of that land to lesser nobles in exchange for a promise of lesser military support, and these in turn made smaller grants until at some point there was a grant to a person (called the freeholder) who actually farmed or lived on the land, and had to provide simple services such as a certain number of days' labour or a certain quantity of grain. These lesser relationships between one who granted land and one who provided services, nested within each other like Russian dolls, were called subinfeudation.
Barter system involves the direct exchange of goods and services for the same.
Barter system involves the direct exchange of goods and services for the same.
A _barter_ system involves the direct exchange of goods and services without the use of money as a medium of exchange.
Free Market is characterized by the unregulated exchange of goods and services.
Feudalism-
Feudalism
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commerce ?
Barter is a system of trade where people exchange good or services without the involvement of money.
political system in which powerful leaders gave land to nobles in exchange for pledges of loyalty and servicefeudalism is something
Barter system