Can someone give me a 10th or 11th grade science fair topic?? i have no clue what to do​

Models are non-visual ways of coummincating how someone thinks about something in the natural world

How is ribosomal rna useful as a molecular clock? a. a large portion of the dna ring is not vital to structure or function, allowing it to accumulate neutral mutations. b. its rate of mutation increases over time as organisms continue to evolve and differentiate from each other. c. a slow mutation rate makes it useful for determining evolutionary relationships between ancient species. d. it is only found in select organisms, making it easier to compare relationships between species that have it.

Idon’t know the answer and i’ve been stuck on it for a while now skskskskks