PLEASE HELP, THIS IS FOR A TIMED FINAL What is the role of RNA polymerase in transcription?
Select one:
a. It binds to the promoter region of a gene and adds new nucleotides to the growing end of nascent mRNA.
b. It binds to the promoter region of a gene and terminates the process of transcription.
c. It binds to the coding region and adds nucleotides to the growing end of the DNA.

Cpr, or cardiopulmonary resuscitation, is a first-aid technique to save lives. it involves compressions of the patient's chest cavity. which description is the best description of the functions of chest compressions in cpr? chest compressions are done to pump the heart. chest compressions are done to strengthen the rib bones. chest compressions increase carbon dioxide inhalation. chest compressions allow the patient's muscles to wake up.

Give examples of selective advantage of organism’s body part/organ

This is a biological reaction due to a stimulus. i need this quickly !