Question

what structures keep the chromosomes untangled during mitosis?
spindle fibers
chromatids
centrioles

Explanation:

Spindle fibers attach to chromosomes at kinetochores and help in their proper alignment and separation during mitosis, preventing tangling. Chromatids are the two - identical halves of a replicated chromosome, and centrioles are involved in spindle - fiber formation but do not directly keep chromosomes untangled.

Answer:

spindle fibers