When geologists refer to the " big five", what are they referring to? 1. the five most important organisms that have become extinct. 2. the five largest mass extinctions in earths history. 3. the five most influential events that have changed the surface of the earth. 4. the five most important inventions that have allowed scientists to study mass extinctions.

What do scientists need to look at before developing an argument

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 the farthest destination to date for a human spaceflight mission?