Birds help take care of each other’s young to increase their chances of survival and behavior is passed on to offspring
The aortic valve separates the left ventricle from the aorta, while the pulmonary valve separates the right ventricle from the pulmonary artery. As the ventricles contract, ventricular pressure exceeds arterial pressure, the semilunar valves open and blood is pumped into the major arteries.
The best way to describe it would be “the pattern of the graph is constantly changing as it goes thru series of increased and decrease through out the years”
B. mass extinctions happen when populations crash due to overpopulation while background extinctions are more likely to result from disease.
I beleve the answer is rotting carcass.
The remaining answer choices are all inorganic.
Hope this helps.
