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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The Inner layer of tissue is used for digestion.
Answer:
a genotype describes the genetics characterstics of an organism
a phenotype refers to the physical characterstics
Explanation:
example of phenotype ; having black eyes
example of genotype ; having brown eyes just like te genes
<span>The celestial sphere is a coordinate system that uses the Earth as a reference. Declination indicates how far north or south from the celestial equator an object is. Right ascension indicates how far east or west from the vernal equinox an object is.</span>
I believe it D
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