A foot and a leg? teeth and gums? a train engine and a box car? q and u?
Answer:
All cells have an outer plasma membrane that regulates not only what enters the cell, but also how much of any given substance comes in. Unlike prokaryotes, eukaryotic cells also possess internal membranes that encase their organelles and control the exchange of essential cell components.
Answer:
C.
Non-controllable risk factors
Explanation:
they are only for driving on the highway
