What is a central idea of the article?

Answers will vary. students can choose descriptive, definition, or demonstration as their type of speech as long as they explain why. descriptive - want to explain dna definition - want to explain the meaning or significance of dna demonstration - want to show how dna is made or created types of organization: if they chose descriptive - spatial (describe topic from top to bottom, etc) or chronological/sequential (explain process of how dna was discovered) if they chose definition - spatial (define parts from top to bottom) or topical (give equal time to all parts) if they chose demonstration - chronological/sequential (step by step how dna is formed/created)  you need to write something for it to be submitted, (asd)