go here to https://www.6sqft. com/nyc-water-towers-history-use-an d-infrastructure/#:~:text=For%20ove r%20100%20years%2C%20water, of%20New%20York%20City%27s%20skylin e.&text=With%20up%20to%2017%2C0 00%20water, the%20structures%20into%20the%20mai nstream. Now write 250 words about what you learned from the article and what you have learned about Water Towers

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.

I’m stuck on this question cuz i’m stupid sksksksk

What characteristic makes a cell membrane selectively permeable