
READING UNIT 6 : POLICE
Quiz by Herdin Gray
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To explain the structure of DNA, the author talks about a pearl necklace. How do these pearl necklaces vary from one individual to another?

What is the purpose of the box headed “How is the genetic identity card revealed”?To explain
What is the author’s main aim?
The end of the introduction (the first shaded section) says: “But how to prove it?”According to the passage, investigators try to find an answer to this question by