Why was it difficult to use dna as evidence in a crime before pcr was invented?

Click on this article and use it to answer the questions below.article on china and controlling the media 1. according to the article, the chinese government has tried to control its people in all of the following ways except: question 1 options: create and spread propaganda in the mediacensorship of the mediaallowing people to create their own social mediadeleting people's social media posts without their permission

There are 25 elements found in living things. how many of these elements are found in some organisms but not all? 1 , 6 , 19 , 25

What were some of the things done to the colonists by king george iii