The cytoskeleton is made of three types of protein fibers: , which serve to support the cell itself; , which serve to support the nucleus and plasma membrane; and , which serve to maintain the shape of the cell and aid in organelle movement.

The cytoskeleton is made of three types of protein fibers: actin filaments, which serve to support the cell itself; intermediate filaments, which serve to support the nucleus and plasma membrane; and microtubules, which serve to maintain the shape of the cell and aid in organelle movement.

Explanation:

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igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

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