Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Fire and Cookery :
Fire and Cookery where and when fiie came to be used is not known. Fire, to start with, must have been a frightening thing, giving rise to many myths and legends. However, as man slowly learned to control it, he found it very useful to keep himself wann and to frighten away wild animals. It is easy to imagine that chance eating of burnt or charred flesh must have led to the idea of cooking, which then made even tough meat edible and tastier. Thus, it must havetremendously increased the number of things one could eat. It was, perhaps, from the use offire for cooking that fired clay pottery and melting of metals for making tools arose.
Boiling gave rise to certain difficulties. At first, water was heated by dropping hot stones into water in leather buckets. We find such itones, cracked by heating and chilling, around prehistoric sites. The crucial discovery, however, was that by coating a basket with thick clay it could be put on the fire. Eventually, towards the end of the Stone Age. it was -discovered that coated baskets crack while heating, whereas pots made of heat-treated clay do not crack. Fired pottery was, tlrerel'ore, a very significant discovery. l.'inally, as Lhc problem of storing liquids for long periods in clay pots was tackled, the slower chemical changes of fermentation could be noted and later used for brewing wine. From the use of dyes, paints and tanning as found in this epoch, we can infer that the use of rudimentary chemistry for transforking materials was also in progress in the later part of the Stone Age.
how to do write the assaigment in botany give idea
Environment impact assessment (EIA) is a tool used for decision making regarding developmental projects and programmes and it may be defined as formal process used to predict the e
Q. What are the differences between anastral and astral mitosis? Astral mitosis is that in which there is formation of the aster a structure made by the centrioles. Anastral mi
Trends in Succession - Ecology Succession is an important aspect of change in ecosystems and a simple description of successional communities the beginning of the story. We ne
Q. What is action mechanism of antibiotic penicillin? Penicillin, discovered by the Scottish doctor Alexander Fleming in 1928, is a drug that inhibits enzymes essential for the
What is the spontaneous generation hypothesis? The spontaneous generation hypothesys, or abiogenesis, asserts that life on earth has come from nonliving material. For instance,
What are the differences and similarities between the bacterial and eukaryotic cell membranes?
Transfer RNA (tRNA) molecules play an very significant role in protein synthesis. Each tRNA becomes covalently bonded to a particular amino acid to create aminoacyl- t
It is defined as the total amount of heat produced, when unit mass/volume of the fuel has been burnt completely and the products have been cooled to room temperature (~ 15 0 C).
How can the presence, localization and function of muscular tissue in beings of the phylum Annelida be explained? In these beings there are a longitudinal muscular layer under
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd