What are the four d"s of negligence? and explain each one

Duty: duty exists when the physician-patient relationship has been established. The patient has sought the assistance of the physician and the physician has knowingly undertaken to provide the needed medical service.
dereliction: failure to perform a duty is the second element required there must be proof that the physician has somehow neglected the duty of the patient.
direct cause: there must be proof that the harm to the patient was directly caused by the actions of the physicians or the failure to act and that the harm would not have otherwise occurred.
damages: the patient must prove that a loss or harm has resulted has resulted from the actions of the physician. 
       Hope that helped! :)

You can literally find this on google of each science career and search up what type of training you need and how many years in school

10/10 recommend bring pads/tampons with you no matter what. im 16 & i’ve had mine since i was 12 and they’re still it regular, but id suggest using the glow app, many women use it for fertility reasons but i use mine specifically for the period tracking portion and it guesses when your next period will most likely be for the next two months. i dont believe theres any way to delay your period, so id say hope for the best but make sure to bring all of your stuff just incase. have a good cruise!