The nurse is considering risk factors for influenza in a group of preschool children. which factors are considered to place children at an increased risk? select all that apply.

There were no choices provided. But there is a related research about this situation. 

Risk factors of influenza transmission in households
Source: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1326070/

>Reasons for increased transmission from children
  The research pointed three causes. 
   1. Children are more exposed to different people in different places. their households, peers in schools and other children.

   2. Children especially preschools are said to have lower immunity which makes them prone and catching influenza.

   3.  Lastly, viral shedding among children can alleviate and spread period of infection.

The open ocean begins at the low-tide mark and extends to the end of the continental shelf

above statement is not a true statement about the open ocean because the open ocean has low levels of nutrients. most of the photosynthetic activity on earth occurs in the open ocean within the photic zone. organisms in the deep ocean are exposed to frigid temperatures and total darkness but it does not begin at the low-tide mark.