Answer:
The heart is a pump, usually beating about 60 to 100 times per minute. With each heartbeat, the heart sends blood throughout our bodies, carrying oxygen ... It sends out an electrical signal to start the contracting (pumping) of the heart muscle.
Explanation:
2and3 only are the defense
Answer: A. The fossils cam from the same organism
Hope this helps!
Explanation:
They melt the shale and then it transforms into a crude, it takes place in rocks.
A particle that releases light- respond if you want a more detailed explination
