Materials are transported within a single-celled

organism by the

(1) nucleus (3) mitochondrion

(2) cytoplasm (4) ribosome

The answer to this question would be: (2) cytoplasm

The nucleus is the organelle in middle of the cell that contains DNA. The ribosome is organelle that has a function in protein synthesize. Mitochondrial has a function in making the energy. Cytoplasm is water inside the cells. Everything would be stored inside it and moving material will need to pass it.