How do tone, mood, plot development, and theme advance the author’s purpose?

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)