Answer:
a big one could be chain effect causing more extinct species
Explanation:
I believe that one water molecule of water is attracted to another because of its polarity.
Answer:
cardiac
Explanation:
An electrical stimulus is generated by the sinus node (also called the sinoatrial node, or SA node). This is a small mass of specialized tissue located in the right upper chamber (atria) of the heart. The sinus node generates an electrical stimulus regularly, 60 to 100 times per minute under normal conditions.
