Which best explains why it is difficult to classify protists? They are all so much like one another. There is a lot of diversity between the organisms. They do not have anything in common with other organisms. They have structures that are hard to observe.

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.

What processes would you expect to be key in the production of yogurt ?

The backbone of the double helix has an alternating molecules. what do you call these alternating molecule?