The answer is true. They cannot only replicate themselves within cells, but they cannot outside of a cell.
The answer is B. The planets were all formed from dust that was orbiting around the sun.
During prophase, the parent cell chromosomes — which were duplicated during S phase — condense and become thousands of times more compact than they were during interphase. ... Cohesin forms rings that hold the sister chromatids together, whereas condensin forms rings that coil the chromosomes into highly compact forms.
