Which types of molecules are able to diffuse across the cell membrane? water molecules

small molecules

very large molecules

fat-soluble molecules

The person who utilize the progression principle will keep adding the difficulty of the exercise that he's doing, while the person who does not, will only stay stagnant.  the person that utilize progression principle, will get a stronger endurance because now his body is conditioned to do harsher routines.{the answer was already on verified)

Few days to several months depending on the severity of the stroke ;

Sources have said that twitter is used to predict flu outbreaks but that is all i know. what are you trying to say?