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.
Answer:
by the movement of electricity
Answer:
For the first one is for earthquakes and the second one is “add toothpicks diagonal across the sides”
The answer is yeasts.
Fungi is the kingdom of Eukaryota domain and includes unicellular organisms and multicellular organisms. Y<span>easts are u</span>nicellular fungi. But, some species have an ability to develop some kind of multicellular characteristics such as pseudohyphae that forms by connecting budding cells.
