Which of the following statements about diffusion are correct?
- Amolecules move from a higher to a lower concentration $ yes; only occurs within living systems $ yes; rate slows down as the temperature increases $ no
- Bmolecules move from a higher to a lower concentration $ yes; only occurs within living systems $ no; rate slows down as the temperature increases $ no
- Cmolecules move from a higher to a lower concentration $ no; only occurs within living systems $ yes; rate slows down as the temperature increases $ yes
- Dmolecules move from a higher to a lower concentration $ no; only occurs within living systems $ no; rate slows down as the temperature increases $ yes