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Answer:
Ans 1-
a prehistoric period when weapons and tools were made of stone or of organic materials such as bone, wood, or horn.
Ans2- Neolithic, also called New Stone Age, final stage of cultural evolution or technological development among prehistoric humans. It was characterized by stone tools shaped by polishing or grinding, dependence on domesticated plants or animals, settlement in permanent villages, and the appearance of such crafts as pottery and weaving. The Neolithic followed the Paleolithic Period, or age of chipped-stone tools, and preceded the Bronze Age, or early period of metal tools.
Ans3-Two grain bearing grass are.....
1. wheat .
2. rice.
Ans4-Flint is a sedimentary cryptocrystalline form of the mineral quartz, categorized as the variety of chert that occurs in chalk or marly limestone. Flint was widely used historically to make stone tools and start fires. It occurs chiefly as nodules and masses in sedimentary rocks, such as chalks and limestones