A) sinoatrial node, atrioventricular node, atrioventricular bundle, bundle branches, Purkinje fibers.
The nucleus of our sex cells stores our genetic information
The answer is C) extrusive igneous. This rock starts as magma, so you know it must be a type of igneous<span> rock. The question tells you that the rock forms when it is cooled by the water, so you know it is formed outside of the Earth's interior, therefore making it extrusive igneous rock.
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Amino acids are the building blocks of proteins
Anything that falls from clouds is considered precipitation so the answer is all of the above.
