Which of the following was not evidence for the cause of the most recent mass
extinction?
a. iridium b. foraminiferan fossils c. shocked quartz d. lava flows

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 is a group of organisms that are closely related and share similar characteristics

Amajor source of energy for your body comes from