Explain in detail about the events involved in the transformation of spermatid into sperm. Comment on why you consider these changes as essential. (UPSC 2018, 15 Marks, )

स्पर्मेटिड के शुक्राणु में परिवर्तन की घटनाओं के बारे में विस्तार से समझाएं। टिप्पणी करें कि आप इन परिवर्तनों को आवश्यक क्यों मानते हैं। (Explain in detail about the events involved in the transformation of spermatid into sperm. Comment on why you consider these changes as essential.)