Question

archaebacteria are considered the youngest, most recent group of organisms. *
true
false
studying ribosomal rna can help scientists learn about ______________. *
genetic relationships
common ancestry
evolutionary time
all of the above

Explanation:

1. Archaebacteria (now called Archaea) are one of the oldest, most ancient groups of organisms, with fossil and genetic evidence showing they evolved very early in Earth's history.
2. Ribosomal RNA (rRNA) evolves slowly and is present in all living organisms. Its sequence differences can reveal genetic relationships between species, indicate shared common ancestry, and be used to estimate evolutionary time scales, so all listed options are correct.

Answer:

1. False
2. all of the above