What body part is included in the circulatory system

How does the author's purpose in this passage differ from an author writing about her personal struggle living with asthma?

Sea stars, sea urchins, sand dollars, and brittle stars are all memeber of a group, what is the common name of the group they are all in

Predict the results of a two base insertion or deletion in a strand of dna that codes for a protien, how does this differ from a three base insertion or deletion?