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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-Mackie
An organism ultimately must obtain all of the necessary energy for life from its environment
The Parasite harms host
The parasite must adapt to beat host's defenses <span />
The answer is D cuz I just looked up a lot of it and saw the pics so ya its D