Answer:
It is called the S-A node, or rather sinus node.
Answer:
variation,inheritance,high rate of populations growth,differential survival and reproduction
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Physical change only change the appearances of a substance, not it’s chemical composition. Chemical changes cause an entirely new substance with new chemical formula.
Answer: because they are situated near aquifers
Explanation:
Aquifers is a underground layer of rock which can hold and release water in desirable amounts so petroleum industries claims the well are safe.