I was supposed to put either T for true or F for false can someone tell me if this is right?

What is the ecological role of food chains and food webs

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.

What could happen if two base pairs on a strand of dna or switched