the process is called codominant where both alleles are expressed — one of each
Answer: D) Pulmonary and aortic valves.
Explanation
There are two main heartbeats from a healthy heart.
The first beat is called the S1 or the lub, and it occurs when the atrioventricular valves (comprising the mitral and tricuspid valves) close.
The second beat is called the S2 or the dub, and it occurs when the semilunar valves (comprising the aortic and pulmonary valves) close.
Listening for heart beats is an essential part of cardiac auscultation.
If all of the decomposers were suddenly removed, then nutrients would not be able to cycle back into the soil so that nutrient uptake by producers could be achieved, or at least not as fast or at as great a level, as it would probably soon enough become inorganic and unusable. Nutrients would be rapidly lost in the ecosystem and would not be able to be put back into the system.