Question

255. हमारे आन्तरिक शरीर अंगों का प्रतिबिम्ब प्राप्त करने
के लिए चिकित्सा निदान में चुम्बकीय अनुनाद चित्र
संचरण (MR) प्रयुक्त किया जाता है। यह मुख्यतः
क्यों सम्भव है?​

Answer 1

Explanation:

Events occurring before the invention of writing systems are considered prehistory. "History" is an umbrella term that relates to past events as well as the memory, discovery, collection, organization, presentation, and interpretation of information about these events. Historians place the past in context using historical sources such as written documents, oral accounts, ecological markers, and material objects including art and artifacts