In the first box : dolphins and grey seals both sleep with half their brain so that the other half can watch for predators
second box : dolphins sleep and swim at the same time ( i think )
third box : ( im sorry but I'm not sure about this one)
i hope this helps a little :)
Answer:
The important detail that should be added to this summary is "The author’s father left the family with nothing."
Explanation:
This summary of "The Rights to the Streets of Memphis.” by Richard Wright need to include the detail that triggers all the following events, that the author's father abandons them and left them without any money or security, sets the new kind of life that each one of them will have to deal with to survive without him and his income.