Answer,
Cytoskeleton
Explanation,
Cytoskeleton is a network of filaments that extends through out the cell through the cytoplasm.It is found on the inside of a eukaryotic cell.It helps the cell maintain its shape and provides mechanical support that enables the cell to carry out division and movement.It holds cell organelles like nucleus in place.cytoskeleton is found in all the cells.The cytoskeleton is also composed of proteins tht form longitudinal fibres in all organisms.