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Material Basis of Primitive Life:
In the primitive society, human beings invented tools for catching animals, and for collecting, transporting and even preparing food. They looked for protection against the elements of nature in the form of clothing and shelter in the caves. The material basis of primitive life is reflected in the tools and other artefacts that have been found in archaeoldgical surveys. The tools are all made up of stones. This is why that era has been named as',the Stone Age. Implements and Tools Stones were shaped to suit a specific purpose like digging, throwing or scraping. Their shapes and sizes became standardised over a period of time in different gkographical regions. These shapes and sizes becade so stable that they continue in some tribal societies even today. You may like to compare the tools used today for hunting, digging or shaping materials with those of the Stone Age shown in Fig.
State the definition of soil The definition of soil has changed a great deal from a thin "outer layer of Earth's crust" to "a collection of natural bodies on the surface of th
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What are some evolutionary advantages of animals with complete digestive tube? The complete digestive tube permits animals to continuously feed themselves without waiting for r
How do respiratory pigments act? Respiratory pigments are oxygen-carrying molecules present in the blood. When the oxygen concentration is high, for instance, in the pulmonary
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Protonephridia and Metanephridia Nephridia take place in two major forms - the protonephridium and metanephridium. Protonephridia are found in flat worms. The protonephridial
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The protein collagen has a high proportion (20% or more) of A. asparagine and glutamine B. proline and hydroxyproline C. glycine D. both A and B E. both A and C F
Determine the Biocompatibility of the material It is a vital factor as we have discussed in detail in the preceeding part of this unit. The nature of the material and its surf
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