The Gene That Encodes Small-Subunit Ribosomal RNA Is Useful for Reconstructing

Multiple Choice

The gene that encodes small-subunit ribosomal RNA is useful for reconstructing the phylogeny of all organisms,because ________.

A) the gene is subject to strong stabilizing selection
B) the gene's function has stayed unchanged in all organisms
C) all organisms have ribosomes with similar composition and structure
D) all organisms have the gene
E) All of the above.