Answer:
B. Protein is composed of DNA which is produced in the cell
Explanation:
Answer: they are all correct so select all
Explanation:
bc i did it and bc i said so
Answer:
When something goes wrong with the sinoatrial node, you may develop a consistently slow heartbeat (sinus bradycardia) or the normal pacemaker activity may stop entirely (sinus arrest). If sinus arrest occurs, usually another area of the heart takes over pacemaker activity. This area is called an escape pacemaker.
Explanation:
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Invasive species or environment
