The double layered sac surrounding the heart is the pericardium
C. the crust and upper mantle
<span>Nervous tissue is comprised of neurons, or nerve cells. These cells receive and transmit electrical impulses to and from the brain. Such impulses are responsible for communication between the brain and spinal cord with every cell in the human body,</span>
Answer:
True
BRAINLIEST IS APPRECIATED :)
Answer:
Mitochondria
Explanation:
The mitochondria produce ATP, also known as energy. It is coined the power house cell.
