Answer to Question 1
Answer: Logical appeals can take place through analogy, induction, or deduction. With analogy, you reason from specific evidence to specific evidence, in effect borrowing from something familiar to explain something unfamiliar. With inductive reasoning, you work from specific evidence to a general conclusion. With deductive reasoning, you work from a generalization to a specific conclusion.
Answer to Question 2
Answer: One challenge in this situation is to make the subject line interesting and relevant enough to capture reader attention. At the same time, however, you have to capture attention without revealing your main idea.
The procedure for making a karyotype.
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The Making of Black Harlem
Facilitated Diffusion: Absorption Methods in the Small Intestine
The 18 exons making up the gene encoding the LDL receptor protein
Examples of Conditions Detected by Prenatal Genetic Screening Methods