Fever
Diarrhea
Fatigue
Muscle aches
Coughing
Answer
A fish ladder can help fish migrate past barriers both natural and artificial (dams)
Explanation
A fish ladder is a structure constructed around natural barrier or artificial ones (dams and waterfalls) to facilitate fish migration in a natural manner. It is also called a fish way, fish pass or a fish step. With the help of such structures, fish protection and restoration is achieved thus boosting their numbers and maintaining a natural habitat.
I think you meant element?
Then it is Krypton because it is in period 4 in group 18, the noble gases.
The Local Group contains the Milky Way Galaxy
