Question

we are reading catching fire. we have a mini project to do. there are 17 questions and i couldn't find 4. so my questions are :
1. what is healing capacity of salt water?
2. why does salt water have those positive effects on us?
3. what is saline solution rinse?
4. what positive effects have people noticed after using a neti pot?

it's a kind of science question but it is for ela the book called "catching fire"


sorry for the trouble
thanksss for helping!
shweta!!!