Cell T is an example of the cells that form the surface of the villi. Explain why there are many microvilli on cell T.

Some of the cells on the surface of the villi secrete mucus for protection.
Suggest what the villi need to be protected against.​

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.

Select the correct answer.what is the observable characteristic of a person called? o a. genotypephenotypeoc.alleleo d.gene

The climate on the leeward side of a mountain differs from that on the windward side mostly in