<span>Pioneer species is the first species to populate an area</span>
The pyramid is not shaped like a typical pyramid, because the bottom should be bigger and getting smaller on top.
Explanation:
The major blood vessels that are connected to the heart include the aorta, the superior vena cava, the inferior vena cava, the pulmonary artery (which takes oxygen-poor blood from the heart to the lungs, where it is oxygenated), the pulmonary veins (which bring oxygen-rich blood from the lungs to the heart) and the coronary arteries (which supply blood to the heart muscle).
