Because when you start talking about your topic,you use to divide it,since it has to do with the 'topic',you don't use a period.
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look at the picture i sent.
Answer:
did you bother him??? probably that's why
Natyashastra<span>, in full Bharata </span>Natyashastra<span>, also called Natyasastra, detailed treatise and handbook on dramatic art that deals with all aspects of classical Sanskrit theatre. ... Its primary </span>importance<span> lies in its justification of Indian drama as a vehicle of religious enlightenment.</span>