Why do biologists believe that a primitive choanoflagellate protist is the ancestor to all animals?

Which statement best describes a typical difference that could be found between the “analysis” and “conclusion” sections of a lab report?

Which of the following must be true for a fossil organism to be useful as an index fossil? a. the fossil organism must be widespread geographically. b. the fossil organism must be abundant. c. the fossil organism must be limited to a short span of geologic time. d. all of the above.

Which base is found only in rna? ribose othymine ouracil o deoxyribose detecteet