d. What are different means of communications?
Exercise
1. Write the answers of the following question.
a. Name different eras of human development,
b. What kind of tools and weapons were used in Stone Age?
c. Why invention of wheel is considered so important in histow?
JU
Answers
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Answer:
a. Periods of Human Development
Or maybe four: infancy, childhood, adolescence, and adulthood. Developmentalists often break the lifespan into eight stages: Prenatal Development. Infancy and Toddlerhood.
b. As technology progressed, humans created increasingly more sophisticated stone tools. These included hand axes, spear points for hunting large game, scrapers which could be used to prepare animal hides and awls for shredding plant fibers and making clothing. Not all Stone Age tools were made of stone.
c. The invention of wheel is considered as an important step of development in the history of science because wheel forms rotational motion which is less than sliding friction. Thats why it's easy step for transportation.
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