F is the symbol for fluorine which is a single atom. A molecule is two or more atoms together, which makes F not a molecule.
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Extension: Produced by the sartorius and quadriceps femoris group of muscles. Flexion: Produced by the biceps femoris, semitendinosus, and semimembranosus muscles. The popliteus muscle facilitates this movement by unlocking the fully extended knee joint.
Eukaryotes are the<span> type of cells that typically do not contain cilia or a flagella.
The ones that do are called prokaryotes.</span>
