The correct answer is letter A
Sinoatrial node (SA) or pacemaker or sino-atrial node: special region of the heart, which controls the heart rate. It is located near the junction between the right atrium and the superior vena cava and consists of a cluster of specialized muscle cells. The rhythmic frequency of these muscle fibers is approximately 72 contractions per minute, while the atrial muscle contracts about 60 times per minute and the ventricular muscle, about 20 times per minute. Due to the fact that the sinoatrial node has a faster rhythmic frequency in relation to the other parts of the heart, the impulses originating from it spread to the atria and ventricles, stimulating these areas so quickly, so that the rhythm of the SA node becomes the rhythm of the whole heart; that's why it's called a pacemaker.
I believe the answer is: The "earth" is made up of elements such as climate, landforms, water, soil vegetation, wildlife, and energy and mineral resources.
<span>The light waves will travel straight from the bug to the fishes' eye because that is the most direct path. </span>
Answer:
Bill of Attainder
Explanation:
A legislative act that declares the guilt of an individual and doles out punishment without a judicial trial. The state legislatures and Congress are forbidden by Article 1, sections 9 and 10 of the Constitution to pass such acts. This is an important ingredient of the separation of powers.
A headland is a coastal landform. It is a point of land, usually high, that extends into a body of water. If a headland is sufficiently large it is called a cape. They are often found in the same coastline as bays. However, a bay is flanked by land on three sides, while a headland is flanked by water on three sides.
If you were to stand on a headland, you would find that you are facing the water, and the water is also to your left and right side.
